delivered the opinion of the court:
Catherine Brzana, a probationary police officer with the Chicago police department, was discharged in December 1988. She filed an action *417against defendants, Leroy Martin, as superintendent of police, and Hubert W. Holton, as commander of the personnel division of the Chicago police department. Brzana seeks reinstatement as a probationary officer, plus damages. The trial court entered summary judgment in favor of defendants.
On appeal, Brzana contends that she was twice disciplined for the same reason, which is not permitted under Illinois law. She also contends that although the superintendent has almost unilateral discretion in terminating probationary employees, he cannot disregard the effect of Brzana’s evidentiary hearing on disqualification, in which the personnel board of the City of Chicago found Brzana eligible to be a probationary police officer under department guidelines.
We reverse and remand.
Background
On July 1, 1985, Brzana was appointed to the position of probationary police officer after she completed an application process. The process includes passing an examination and undergoing a background investigation. About three weeks into Brzana’s training period, she was ordered to submit a urine specimen as part of the department’s drug-screening program. According to the police department, her specimen contained “THC (Cannabinoids) metabolite carboxytc.” While this is not further explained, we assume it refers to a measurable amount of the active ingredient in marijuana. In accordance with police department policy, this test result triggered a complaint registration and internal investigation into Brzana’s suspected use of cannabis. Under the procedures that govern the use of drug screenings, Brzana presumably would have been entitled to what is called a “drug conference” before being terminated. Under the personnel rules of the police department, the drug conference is described as an informal hearing at which the employee may appear before a hearing officer, without counsel, and give evidence to defend herself against documentary evidence relating to her alleged use of drugs. Instead, what happened in the pending case is that Brzana was told that she could either resign or be fired. She chose to resign and did so on August 30, 1985. At the time, apparently, there was little or no evidence of Brzana’s alleged use of cannabis except for the urinalysis itself.1
After Brzana’s resignation, a detective in the police department suggested that Brzana reapply for the position of probationary police officer. *418She then resubmitted her application and successfully passed all phases of the application process. During the routine background check, however, it came to the superintendent’s attention that she had resigned previously and that she did so during the investigation into her alleged use of cannabis. Based on this prior incident, the superintendent of police recommended to the commissioner of personnel that Brzana’s name be removed from the list of qualified candidates for the position of probationary police officer.
By letter of May 15, 1986, the commissioner of personnel notified Brzana of the superintendent’s decision to disqualify her from appointment to the police department. The reason given for her disqualification related to the drug test and her resignation during the investigation. According to the May 16 letter, she had until June 5 to submit a written request for an evidentiary hearing. For reasons that remain unexplained in the record or briefs, Brzana did not get that hearing until two years later, in May 1988.
Evidently, there are two types of hearings that a candidate for police officer may request, depending on the circumstances. One is the drug conference previously mentioned, during which a hearing officer reviews evidence and determines whether the candidate has in fact abused drugs and therefore should be disqualified from service. The second type of hearing is available when a candidate is disqualified as a result of her “background investigation.”2 In that hearing, the candidate may be represented by counsel. A series of letters in the record demonstrate confusion over what type of hearing Brzana was to receive and the precise statement of reasons for her disqualification.
The May 1986 letter from the personnel department to Brzana informed her that the disqualification was based on the background check. She was told that she was entitled to have counsel present. By letter dated August 26, 1987, however, the author of the May 1986 letter explained that the “original notice sent out to Ms. Brzana was in error and it should have been scheduled as a Drug Conference (Section 28 of the Administrative Hearing Procedure).” Still later, on January 4, 1988, the chairman of the personnel board sent a letter to Brzana regarding the upcoming conference to review [her] disqualification from the Chicago Police Department based on the results of [her] drug screening test.” The *419author of that January 4 letter also sent a letter to Brzana’s attorney, dated February 1, 1988, setting a date in March for “a hearing regarding Ms. Catherine Brzanas’ recent investigation background by the Chicago Police Department.”
An internal letter to the commissioner of personnel from Rudolph Ni-mocks, the police department’s deputy superintendent of bureau of administrative services, emphasized that Brzana’s hearing should be one to review her disqualification “because of unfavorable background investigation, not a hearing to review evidence of drug usage.” This letter, dated January 13, 1988, further states that Brzana resigned “rather than cooperate with the [drug use] investigation and make a statement regarding the findings of the urine analysis.”
In May 1988, more than two years since she had reapplied to the police department, Brzana was finally given a hearing on the facts and circumstances that surrounded her disqualification. The hearing officer took evidence on the matter and concluded that the superintendent’s reasons for Brzana’s disqualification from eligibility were unfounded.
As revealed in the May 1986 letter, the original reason that the superintendent gave the commissioner of personnel for finding Brzana disqualified from eligibility as a probationary employee was this: Brzana’s 1985 urine specimen tested positive for cannabis and she resigned during the ensuing investigation. (That Brzana was given the option of resigning is undisputed, however.) The January 1988 letter from Deputy Superintendent Nimocks to the commissioner stresses that the background investigation hearing would not “review evidence of drug usage” and further stated that Brzana failed to cooperate with the investigation by resigning.3 There was no competent evidence adduced at the hearing to *420support the charge of noncooperation, apparently, and the three-member personnel board, upheld the hearing officer’s findings in favor of Brzana.
The personnel board did not determine whether or not the 1985 urinalysis established that she had used marijuana, as that was not the point of the hearing. Nevertheless, the board was made well aware of the urine test and the fact that it was the basis upon which the superintendent recommended that Brzana be disqualified as a candidate for service as a police officer. The board rejected the superintendent’s recommendation after considering the evidence and determined that the 1985 incident was insufficient to disqualify her. Accordingly, the board returned Brzana’s name to the eligibility list. After an investigator for the police department came to her home to conduct an updated background check in early November, Brzana was told to report for training. On December 5, 1988, Brzana began her second period of probationary employment with the police department.
Ten days later, Brzana was told that at the close of the business day, December 15, 1988, she would be terminated due to her violation of the police department’s Rule 2. Rule 2 states:
“Any action or conduct which impedes the Department’s efforts to achieve its policy and goals or brings discredit upon the Department.”
The factual basis for her violation of Rule 2 was, once again, the July 1985 urinalysis and Brzana’s resignation during the investigation of the drug test.
In accordance with the personnel department’s rules, the superintendent notified the board, in writing, of his decision to terminate Brzana as a probationary employee. The rules do not provide a probationary police officer with the right to challenge termination, as such employment is “at will.” Hence, the probationary employee generally has no right to a hearing upon termination. Brzana sought relief in the circuit court, however, because she believed her 1988 termination was based upon the same 1985 incident that the personnel board had just rejected as a reason for finding her disqualified from the group of eligible candidates for service in the police department.
Opinion
The pending case presents an interesting conflict between the superintendent’s “unfettered” right to order the termination of a probationary employee and the administrative due process rights of that employee who has been, in substance, “cleared” of the charge for which she was terminated. Can the superintendent base his termination of an *421employee on the same reason for which he believed her to be disqualified from becoming a probationary officer, following an evidentiary hearing in which an adjudicative body finds her qualified under the department’s own rules and procedures?
The parties’ statements of the issues differ. Brzana contends initially that it was error for the trial court to sustain the defendants’ position because she was originally forced to resign or be fired in 1985 and then was again “disciplined” for the same charge in 1988, when she was subsequently terminated. In support she cites the case of Messina v. City of Chicago (1986), 145 Ill. App. 3d 549, 556, 495 N.E.2d 1228, 1233, where the court stated, “Probationary employees can still be dismissed for any legal reason, so long as that reason has not been the basis of a previous disciplinary action.”
This formulation of the issue, we believe, may lead to confusion or strained analysis because it focuses on whether her resignation constituted a “disciplinary action” by the department such that her ultimate termination in 1988 became an improper “double discipline” for the same conduct. The underlying notion of this argument resembles the “double jeopardy” or res judicata concept of not allowing a person to be subjected twice to punishment for the same conduct or be forced to relitigate settled issues. It is true that the impetus for Brzana’s 1985 resignation, the 1988 disqualification hearing, and her subsequent termination have in common the effect to be given her urine test results. Nevertheless, we believe that a more straightforward formulation of the key issue centers on the nature and scope of the administrative due process rights that are provided under the personnel department’s rules and police department standards.
Before examining those rules, we note that defendants rely heavily on the well-established principle that the superintendent of police may fire a probationary police officer for any legal reason, without giving the employee a hearing or right to challenge the discharge. (E.g., Romanik v. Board of Fire & Police Commissioners (1975), 61 Ill. 2d 422, 425, 338 N.E.2d 397. See Beazley v. Wosik (1988), 119 Ill. 2d 437, 440, 519 N.E.2d 468 (job applicant had no right to hearing on his disqualification based on psychological examination); People ex rel. Shelton v. City of Chicago (1973), 13 Ill. App. 3d 729, 731, 301 N.E.2d 162.) The rationale for this is the simple recognition that probation is literally a trial period during which the potential career officer is being evaluated by his superintendent. The period of probation enables the appointing officer to determine whether a permanent appointment is desirable, a question that by necessity is left to his or her sole judgment as appointing officer. (See Schmidt v. Personnel Board (1980), 89 *422Ill. App. 3d 434, 436, 411 N.E.2d 1060.) We note that in the pending case, Brzana was not terminated because of an adverse evaluation of her demeanor or work during the probationary period. Rather, it was the drug-screening results of July 1985 that led to her resignation and, in 1988, to her ultimate termination from the police department.
We agree that the superintendent of police must be free to weed out those probationary officers who are unsuited, in his opinion, for career service with the Chicago police department. Therefore, in the vast majority of such terminations, the employee will have no forum to challenge the decision because the police department is not required to grant review of the superintendent’s discretionary terminations of probationary officers. But cf. Foley v. Civil Service Comm’n (1980), 89 Ill. App. 3d 871, 412 N.E.2d 612 (administrative agency’s failure to follow its mandatory time periods for notifying probationary officer of discharge voids termination).
The pending case, however, calls into play more than just the superintendent’s conceded discretion in the firing of probationary officers. At issue is not simply the question whether Brzana could have been terminated for her alleged use of marijuana back in 1985. No doubt, she could have been fired in 1985, provided that she was given the right to participate in a drug conference proceeding and was found to have ingested marijuana. Based on that evidentiary finding, she presumably would have been terminated or found disqualified and that would have been the end of the matter, because her firing would have been for a legal and valid reason.
What happened instead was that Brzana resigned, as she was permitted to do, and then reapplied, as was suggested to her by a detective in the training center. After passing the application process again and undergoing a background check, Brzana was informed that she would be disqualified from further consideration because the background check revealed her earlier resignation during the investigation into her alleged drug use. She was also informed of her entitlement to a hearing on the matter, and defendants do not dispute her right to such hearing.
Section 27(d) of the administrative hearing procedures of the personnel board of the City of Chicago provides:
“Section 27. Drug Screening for Police Officer Candidates.
(a) All applicants for the position of Police Officer and who have passed a written examination therefor shall submit to drug screening'by urinalysis, such urinalysis to be administered under the direction of the Superintendent of Police. Subject to the provisions hereof; any person found to have used marijuana; or a *423controlled substance (as defined under state or federal law) without a prescription; or misused a prescription drug; or used a prescription drug without a prescription, by reason of urinalysis shall, wpon recommendation of the Superintendent of Police, be disqualified from appointment to the position of Police Officer. The urinalysis shall include an EMIT test of each sample and in the case of positive results, a confirming GCMS of each specimen. The manner of testing and custody of specimens shall be under procedures approved by the Commissioner of Personnel.
(b) The Superintendent of Police shall notify the Commissioner of Personnel of his or her recommendation for disqualification in writing, and shall enclose with such recommendation any laboratory reports or other documentation concerning the applicant’s specimen. Upon receipt by the Commissioner of Personnel of a request for disqualification from the Superintendent Of Police based upon the results of urinalysis, the Commissioner of Personnel shall cause a notice to be sent to the applicant by certified mail *** stating that the Superintendent has requested the applicant’s disqualification, the applicant’s name shall be stricken from the eligible list for the position of Police officer and that the applicant may request a review of said disqualification in the manner provided for in part (d) below. A copy of the laboratory reports or other documentation forwarded to the Commissioner of Personnel by the Superintendent of Police shall be included with the notice.
(c) If the Superintendent requests disqualification on additional grounds not related to the urinalysis results, the Superintendent shall include a separate statement to that effect and shall enclose any documentation in support of said additional grounds. If the Superintendent of Police desires disqualification on grounds in addition to the urinalysis results, the Commissioner of Personnel shall so state in the notice and shall further state that said additional grounds will be considered for disqualification only if the applicant appeals disqualification on the basis of the urinalysis results and such appeal is successful.
(d) An applicant whose disqualification is requested on the basis of urinalysis results may request a conference with a hearing officer designated by the Personnel Board by delivering a written request therefor to the Commissioner of Personnel by delivering a written request therefor to the Commissioner of Personnel within 20 days of the mailing of the notice provided in part (b). Upon receipt of a request therefor, the Commissioner of *424Personnel shall notify the applicant of the time and place of said conference. At said conference, the Hearing Officer shall consider the laboratory reports and other documentation submitted by the Police Department and the applicant may submit written documentation supporting his or her position. The Police Department may designate an employee of the Department to attend the conference and may submit additional documentation supporting its position. The conference shall be informal, and no formal legal representation of the applicant or the Police Department shall be permitted nor shall the hearing officer be bound by or apply formal rules of evidence. The Hearing Officer shall prepare a written report and recommendation and submit the same to the Personnel Board, together with any documentation submitted by the applicant or Police Department. The Personnel Board shall thereafter render its decision on the disqualification. ” (Emphasis added.)
We infer that the above, detailed provisions recognize that employment decisions based on the results of drug screenings require certain guidelines, so as not to be “self-proving.” The existence of such rules and safeguards may well be due to a belief that firings based on urinalysis results alone would be open to an assortment of legal challenges, including constitutional ones. Whatever the purpose behind the establishment of the drug conference, once such procedures are established, they must be followed by the police department and its members, including the superintendent. See, e.g., Sye v. Wood Dale Fire Protection District No. 1 (1976), 43 Ill. App. 3d 48, 50-51, 356 N.E.2d 938; Farmer v. McClure (1988), 172 Ill. App. 3d 246, 255, 526 N.E.2d 486, 493, appeal denied (1988), 123 Ill. 2d 557, 535 N.E.2d 400 (“ ‘The mere fact that plaintiff was a probationary employee gave defendants no authority to act outside of their own rules’ ”), quoting Messina v. City of Chicago (1986), 145 Ill. App. 3d 549, 556, 495 N.E.2d 1228.
Quite clearly, the rules provide that the personnel board shall decide the issue when a candidate’s disqualification is based on the mandatory drug-screening procedure. It is undisputed that Brzana was not, in 1985, given the benefit of this informal hearing as a prerequisite for termination and her affidavit of record states that she was not notified of this right. Instead, she was told to either resign.or be fired. We imply no criticism of the department for offering her this choice. Once she resigned there was no need for the department to continue its investigation into her possible use of marijuana; the whole issue had become moot.
*425When Brzana reapplied, however, and the superintendent decided to use the urinalysis as a reason for recommending her disqualification, there would seem to be no barrier to reactivating the drug-use investigation and conducting the drug conference hearing at that time. Brzana reapplied within a month or so of the initial resignation. The background check revealed her earlier resignation and its reason. The police department could have proceeded then with the drug conference. If Brzana were found to have used marijuana, the superintendent could have terminated her with impunity (assuming she was unsuccessful in her appeal of the finding, such right of review implicit in the above-quoted rules regarding the drug screening).
In fact, as the letters of record indicate, the commissioner of personnel believed that since Brzana’s disqualification was based on the 1985 drug screening, her upcoming hearing would be scheduled as a drug conference. It was not until the passage of almost two years that Deputy Superintendent Nimocks admonished the commissioner of personnel, in his January 1988 letter, that what Brzana was to receive was not a drug conference but a “background disqualification hearing.”4
Nimocks’ January 1988 letter to the commissioner of personnel also emphasized Brzana’s “lack of cooperation” with the police department investigation into her alleged use of marijuana back in 1985. Apparently equating her resignation with lack of cooperation, Nimocks informed the commissioner that the upcoming hearing would not be one “to review evidence of drug use.”
The parties do not explain the distinction between the two types of hearings, or whether the distinction is significant in the pending case. Defendants do suggest that because the 1988 hearing did not adjudicate Brzana’s actual use of drugs in 1985, the police department was free to use the drug-use allegation as grounds for her termination following her appointment as a probationary employee.
We believe that such reasoning elevates form to such degree as to virtually gut the drug-screening safeguards. On the record before us it cannot be denied that Brzana was terminated solely because of the *426drug screen. Further, it is undeniable that the drug-screening procedures were not followed in this case. Brzana’s original notice of disqualification, in May 1986, cited the 1985 urinalysis and her resignation as the sole basis for her disqualification. All of the police department’s stated reasons, including “lack of cooperation,” were in issue at the evidentiary hearing. That was the purpose of the hearing, to see if the superintendent’s reliance on the urine test results and Brzana’s subsequent resignation or lack of cooperation disqualified her as a candidate for service in the police department. By its rejection of the superintendent’s reasons for finding Brzana “disqualified,” the administrative body charged with adjudicating disputed issues of fact concluded that Brzana was not disqualified from becoming a probationary police officer, notwithstanding the 1985 urinalysis results and her subsequent resignation.
The question that remains is what impact this eligibility determination of the personnel boan¡l should have on the superintendent’s right to fire Brzana as a probatibnary officer a few days after she was told to report for training. Although the trial court viewed the issue differently, we believe it is wrong for the courts to countenance a total disregard of an administrative adjudication under the guise of deferring to the superintendent's right to discharge probationary employees “at will.” Whether the superintendent may ever override the personnel board’s factual decision in other contexts is not before this court. See People ex rel. Ryan v. Civil Service Comm’n (1969), 117 Ill. App. 2d 50, 253 N.E.2d 913 (superintendent of police properly asked Civil Service Commission to reconsider its certification of plaintiff as a patrolman on issue of physical condition and the court noted that an appointing officer has some discretion in appointing persons certified to open positions); cf. Davern v. Civil Service Comm’n (1970), 47 Ill. 2d 469, 269 N.E.2d 713, cert. denied (1971), 403 U.S. 918, 29 L. Ed. 2d 695, 91 S. Ct. 2229 (disqualified candidate for police officer unsuccessfully challenged commission’s finding of disqualification; the supreme court held that the commission’s findings on disqualification were not against the manifest weight of the evidence).
Our narrow concern here is twofold. First, we wish to ensure that the drug-screening procedures are not circumvented when a candidate is given a full hearing on drug-related grounds for disqualification, wins, becomes a probationary police officer, and is then discharged on the basis of the very drug charge that triggered the disqualification hearing in the first place. Second, we wish to affirm the integrity of quasi-judicial, administrative decisions that emerge from evidentiary *427hearings. Allowing unilateral or collateral “reversal” of such adjudications denigrates the entire process.
With that in mind we address defendants’ attempt to characterize Brzana’s 1988 termination as somehow separate and unrelated to the results of the disqualification hearing. Basically, defendants maintain that because the board did not rule on the specific question of whether she had used drugs, the superintendent was free to reactivate the 1985 urinalysis results, or related reasons, as the basis for Brzana’s termination in 1988. We do not agree. The 1985 urinalysis cannot become the litmus test for Brzana’s fitness to become or remain a probationary employee, particularly when the board was well aware of the urinalysis and its significance in the superintendent’s recommendation for striking Brzana from the list of qualified candidates. Contrary to defendants' statement that “[t]here is simply no reason to suppose that plaintiff’s discharge and hearing were for the same reason,” we find every reason to make that conclusion. The record bears this out.
We recognize that there is a real difference between the personnel board’s role in certifying or placing candidates’ names on eligibility lists and the supervisor’s separate right to reject any probationary employee for any reason that is not an “illegal” one. The superintendent, not the personnel board, is responsible for ensuring that the trainee officers can handle the job down the line. This is why the superintendent is accorded nearly absolute discretion in terminating probationary officers. His observation of their job performance, coupled with long experience and sound judgment, leads, ideally, to employment decisions that will implement his criteria for an excellent police force. As a matter of policy, probationary employees are not given the right to contest their termination, even if they believe the superintendent’s decision is unfair or unfounded.
In contrast to the superintendent’s responsibility for the ongoing evaluation of his employees, the personnel board’s concerns are largely limited to the question of initial eligibility under the applicable guidelines. If the superintendent recommends disqualification after a background investigation, as happened here, the board is the body charged with making the final decision following an evidentiary hearing on the grounds for such recommendation.
If the superintendent could never be bound by the substantive effect of such decisions, there would be little need for them. As noted, the right to these hearings was established in Federal court litigation arising from Chicago’s allegedly discriminatory hiring procedures. (See United States v. City of Chicago (N.D. Ill. 1974), 385 F. Supp. 543.) If the superintendent may disregard the personnel board’s decision on a *428person’s disqualification by firing him or her for the same reasons as were at issue in the disqualification hearing, the administrative procedure is a nullity.
The record and briefs before us do not set out in full the administrative rules of the personnel board or the rules of the police department. Nor have the parties analyzed the relationship between the personnel board and the police department. Our own analysis, however, reveals no solid basis upon which to assume that Brzana’s background investigation hearing was meant to be advisory (or, to be accurate, illusory).5 It is no answer to state that the superintendent has power to terminate probationary officers while the personnel board only rules on issues relating to initial eligibility. While that is true as far as it goes, in the pending case the superintendent’s termination of Brzana, as a probationary employee, clearly was for the same reasons as were ruled “unfounded” in the disqualification hearing accorded to Brzana by law.
Defendants admit that Brzana’s termination, just days after beginning her probationary period in 1988, was premised on the department’s own “finding” that she had drugs in her system in July 1985. As we have concluded, mere allegations of drug use based on the 1985 urinalysis do not transform into findings of drug use, absent the type of procedures contemplated in the administration’s own rules for dealing with drug-screening cases.
Could the superintendent have terminated Brzana in 1988 for reasons unrelated to the 1985 incident? Yes. Could he terminate her for that same 1985 incident, once the personnel board had entered a ruling in her favor? No. Any other result would reduce the evidentiary decision of the board to mere window dressing.
It is important to bear in mind that we are not advocating any substantial diminution in the superintendent’s authority to discharge probationary employees who are found, after the pertinent hearing, to have smoked cannabis. Here, however, we are asked to presume not only that Brzana in fact used drugs but also that the charge of drug use alone, based on the 1985 urinalysis, is self-sustaining. As we noted, to adopt that position would be to disregard the very rules that the police department is bound to follow. See Farmer v. McClure (1988), *429172 Ill. App. 3d 246, 526 N.E.2d 486; Messina (1986), 145 Ill. App. 3d 549, 495 N.E.2d 1228.
Because we find that Brzana’s position is well taken and that the defendants did not follow their own rules and regulations regarding the drug conference hearing in the first place, we conclude that the trial court erred in entering summary judgment in favor of defendants. Accordingly, we reverse the judgment and remand for further proceedings. We agree that the material facts relating to Brzana’s termination in 1988 are not in dispute, and we remand only for consideration of damages or other relief. Our holding is limited to nullifying Brzana’s 1988 discharge based on the 1985 urinalysis, resignation, and surrounding circumstances. Any further use of the 1985 incident is thus barred as a basis of discipline or termination in the future.
In conclusion, we note that the administrative hearings provided under the rules give people in Brzana’s position a limited right to contest their termination as probationary employees, at least when the termination is plainly linked to the same grounds as were rejected in the evidentiary hearing on disqualification. We do not believe our narrow holding will have an adverse or unintended affect on the superintendent’s authority to deal with probationary employees in other contexts.
Reversed and remanded.
JOHNSON, J., concurs.