delivered the opinion of the court:
Steven Jones and defendant, Bill Tipton, were charged by indictment with selling a substance represented to be a controlled substance (Ill. Rev. Stat. 1975, ch. 56/2, par. 1404). The white powder that they had sold contained no controlled substance. Jones pleaded guilty and testified on behalf of the State at defendant’s trial. A jury returned a verdict of guilty against defendant, and the circuit court of Madison County entered judgment and sentenced defendant to two years’ probation, with conditions. The appellate court reversed, finding entrapment as a matter of law (68 Ill. App. 3d 193), and we allowed the State’s petition for leave to appeal.
The State’s first witness was Michael T. Boyne, a narcotics agent with the Metropolitan Enforcement Group of Southwestern Illinois (MEGSI). Boyne first testified that on September 1 or 2, 1975, he went to defendant’s home, accompanied by fellow agent Charles Nunn and an informer, Nancy Niehaus. Niehaus, who had briefly dated defendant, arranged the meeting to see if defendant could find any cocaine. Defendant’s nine-year-old brother was also present.
Relating his account of the meeting, Boyne testified, “We had a general drug conversation and Nancy had asked him if he got the cocaine for us. *** He said that he would have to make some phone calls. *** He was telling us how he had taken some acid and he was out looking at the swimming pool and he kept telling the little brother to get out of the room and he told us that he was really funny when he gets him high. ” In his own testimony, defendant later admitted making the statement about getting his brother high. Also during the meeting, according to Boyne, defendant attempted two *481or three times to telephone someone whom he referred to as “Steve” in an effort to locate cocaine.
Boyne further testified that on September 3, 1975, he called defendant at 4:30 p.m., and defendant informed Boyne that a meeting was arranged with a third party for 6 p.m. that day at the Funland Miniature Golf Course. According to Boyne, defendant indicated that the third party had $30 worth of cocaine which could be broken down into six or seven “dime” bags. Boyne drove to defendant’s home, picked up defendant, and they then proceeded to Funland. On cross-examination, Boyne explained that he picked up defendant because he did not know the party with the cocaine.
Boyne testified that they arrived at Funland at approximately 5:40 p.m. and began playing pinball. A few minutes later, Steve Jones arrived and defendant introduced him to Boyne. According to Boyne, he, defendant and Jones engaged in general conversation, and defendant shortly thereafter asked Jones if he had the “stuff. ’’Jones suggested that they go to his car.
Boyne testified that, while in the car, he, defendant and Jones again held a general conversation on different topics, including drug usage, and that Jones handed him an aluminum package in exchange for $30 in MEGSI funds. Boyne testified that Jones said that the package contained “half cocaine and half speed.” Laboratory tests, however, later indicated that no controlled substance was present.
Boyne also testified that Jones offered to get Boyne LSD, cocaine or anything else that Boyne wanted. According to Boyne, Jones said that Boyne could contact him through defendant. Over objection of defense counsel, Boyne then testified that defendant arranged a similar sale with Jones approximately one month later, on October 1, 1975.
On cross-examination, defense counsel asked a series of questions to ascertain the nature of Boyne’s contacts *482with defendant. In response to these questions, Boyne testified that he never met defendant before September 1975; that, following their initial meeting, plans for a drug sale were not consummated; that he never saw defendant handle or receive money for drugs; that defendant did not say that he had any drugs but that he could get some; that defendant used the word “cocaine” rather than some slang term; that defendant never solicited Boyne to sell drugs; that, following the September 3 sale, Boyne called defendant; and' that, following the October 1 sale, Boyne called defendant once or twice more without any results, either because defendant could not get anything or because Boyne failed to follow up on his initial effort.
On redirect examination, Boyne testified that, if he called defendant and defendant did not then have anything, defendant would tell him to call back.
Steven Jones also testified on behalf of the State. Jones first testified that he received several phone calls from defendant in which defendant asked whether J ones had obtained any cocaine for Nancy Niehaus ’ “boyfriend,” referring to Boyne. Jones reiterated the details of the September 3 meeting and sale, and he then testified that he knew defendant from school and had known him for approximately V/z years.
On cross-examination of Jones, defense counsel again propounded a series of questions to ascertain the nature of the witness’ contacts with defendant. Jones testified that defendant never touched the drugs sold or received any money from their sale; that defendant never before had brought anyone to buy drugs; and that he had no agreement with defendant to arrange sales. Though apparently not anticipated by defense counsel, Jones also testified that, following the September 3 sale to Boyne, defendant brought a friend to buy drugs but that no more drugs were actually sold.
In his defense, defendant pleaded entrapment (Ill. *483Rev. Stat. 1975, ch. 38, par. 7 — 12), claiming improper inducement by Boyne and Niehaus, the latter said to be an agent of the government by virtue of her role as a paid informer. Defendant testified that he had dated Niehaus for three or four weeks but had ceased dating her a couple of weeks before Niehaus brought Boyne and fellow MEGSI agent Nunn to defendant’s home. At his home, according to defendant, the parties talked on various topics but not drugs.
Also according to defendant, on the next day, Niehaus called and asked if defendant could get her some cocaine, and he replied that he did not know and would have to see what he could do. According to defendant, Niehaus called him again, asking defendant again to try to get some cocaine and saying that the favor would be returned. Defendant testified that he had thought no more of finding cocaine until Niehaus called and again asked if he had found anyone to sell cocaine to Boyne.
Defendant testified that he saw Steve Jones at school the next day, and Jones said that he was selling cocaine and that defendant should let him know if he knew of anyone who wanted to buy any. Defendant testified that he had known Steve about six months and that it was known around school that Steve was “into drugs. ”
Defendant testified that, following the discussion with Jones, he received a call from Niehaus asking if he found anyone who would sell her cocaine, and he gave her Jones’ name. According to defendant, he then informed Jones that he knew someone who wanted to buy cocaine, and Jones suggested Funland as a meeting place. Defendant testified that he never used drugs, never had done anything like this before, and had arranged the sale only to do Niehaus a favor. He also testified that Niehaus thanked him for arranging the sale and said that she would return the favor.
Defendant next testified that, on the day of the sale, September 3, he, his brother and a friend were planning *484on going to Funland to play pinball and were waiting for the friend to finish washing dishes when Boyne arrived, asking where Funland was located. According to defendant, he gave Boyne directions but Boyne asked defendant to accompany him since both were going to Funland and since Boyne was not sure where it was located. Defendant agreed, and he and his brother left with Boyne.
Defendant’s account of the details of the actual sale followed and was substantially similar to that related by Boyne. On cross-examination, defendant admitted that the idea of getting the cocaine from Jones originated with him, but he reiterated that the sole reason for his involvement was his desire to do Niehaus a favor.
Following the close of defendant’s evidence, the jury returned a verdict of guilty and the circuit court entered judgment, sentencing defendant to two years’ probation with certain conditions, including the requirement that defendant spend the last 60 days of probation in the county jail. The appellate court reversed on the basis of its finding that entrapment existed as a matter of law.
In its appeal to this court, the State argues that the appellate court erred in finding entrapment. It also challenges the appellate court’s ruling that part of Boyne’s testimony, concerning defendant’s involvement in a subsequent drug transaction, is inadmissible. Because of the potential impact of Boyne’s testimony on the entrapment issue, we address the evidentiary issue first. The parties have cited no cases in this jurisdiction directly in point, and our research has revealed none. We have examined analogous cases in this State, however, and we now hold, in accordance with the majority of other jurisdictions addressing the point, that evidence of a defendant’s subsequent activities is admissible when a defendant pleads entrapment if the evidence is relevant to the issue of predisposition.
In the oft-cited Sorrells v. United States (1932), 287 *485U.S. 435, 451-52, 77 L. Ed. 413, 422, 53 S. Ct. 210, 216, the United States Supreme Court held that “if the defendant seeks acquittal by reason of entrapment he cannot complain of an appropriate and searching inquiry into his own conduct and predisposition as bearing upon that issue. If in consequence he suffers a disadvantage, he has brought it upon himself by reason of the nature of the defense.” In accordance with this principle, most courts addressing the issue of the admissibility of subsequent acts have approved the use of such evidence when a defendant raises the entrapment defense. (Annot., 61 A.L.R.Sd 293, 319-23 (1975), citing United States v. Rodriguez (5th Cir. 1973), 474 F.2d 587, 589-90; United States v. Santore (E.D. Pa. 1958), 164 F. Supp. 362, 366; Aller v. State (1974), 61 Wis. 2d 740, 741, 214 N.W.2d 431, 432; State v. Monsoor (1973), 56 Wis. 2d 689, 703, 203 N.W.2d 20, 27; People v. Calvano (1972), 30 N.Y.2d 199, 206, 282 N.E.2d 323, 326, 331 N.Y.S.2d 430, 436; Berlin v. State (1971), 12 Md. App. 48, 59-60, 277 A.2d 468, 474-75; see also United States v. Smith (2d Cir. 1960), 283 F.2d 760, 762-64; but see United States v. Daniels (5th Cir. 1978), 572 F.2d 535, 538; State v. Anaya (N.M. App. 1969), 81 N.M. 52, 54-55, 462 P.2d 637, 639-40.) The principle to be derived from these cases is that evidence of subsequent acts is admissible if relevant to the issue of predisposition of the defendant to commit the offense charged; relevancy is measured in terms of similarity and proximity in time.
More important than the fact that other jurisdictions have adopted this rule is that the principle upon which the rule is based can be found in the treatment of analogous situations under existing Illinois law. As Card states in his text, “Both prior conduct and subsequent conduct may be relevant ***, depending on the circumstances and the probative value of the collateral conduct sought to be proven. Evidence of other specific, though similar acts, may not be proven simply to show that, *486having done the same thing before, the person is likely to have done it on the occasion in issue. This would open the door too wide to the trial of side issues to the neglect of the immediate issue to be resolved. But for the limited purposes of proving state of mind, motive, intent, habit, pattern, or plan, conduct on other occasions is often the best if not the only evidence by which the facts can be established.” (Emphasis added.) (S. Card, Illinois Evidence Manual R. 4:09, comment, at 162-63 (2d ed. 1979); see, e.g., People v. Lehman (1955), 5 Ill. 2d 337, 343 (subsequent act admissible to show plan); People v. Allen (1971), 1 Ill. App. 3d 197, 200-02 (subsequent act admissible to refute argument that the defendant lacked intent); People v. Knox (1967), 90 Ill. App. 2d 149, 160-61 (subsequent act admissible to show plan).) The cases cited and the passage from Card do not specifically approve of the use of evidence of subsequent acts when a defendant pleads entrapment, but we believe that such a conclusion is logically required. By pleading entrapment, a defendant opens the door for the admission of evidence which might otherwise be inadmissible, and it would be inconsistent with this concept to exclude, in an entrapment case, evidence deemed admissible in other contexts. In People v. Stadtman (1974), 59 Ill. 2d 229, relied upon by the appellate court in holding that evidence of subsequent acts is inadmissible, neither predisposition nor any other issue was raised on which “other acts” would be relevant, and the appellate court’s reliance on that case was therefore misplaced.
In reviewing the present case, we cannot say that the circuit court abused its discretion in admitting agent Boyne’s testimony that defendant arranged a similar drug deal approximately one month after the offense for which defendant was on trial. By virtue of defendant’s plea of entrapment, the question of predisposition was raised, and the circuit court could reasonably conclude that evidence of similar activity one month later was of pro*487bative value on this issue.
The second issue raised by the State in its appeal is whether the appellate court erred in finding entrapment as a matter of law and setting aside the jury’s verdict of guilty. Once the entrapment defense is raised, it becomes incumbent upon the State to prove beyond a reasonable doubt that entrapment did not occur. (Ill. Rev. Stat. 1975, ch. 38, par. 3 — 2(b); People v. Dollen (1972), 53 Ill. 2d 280, 284.) The question of entrapment in a jury trial, however, is usually one for the jury, unless the trial court or a reviewing court can find entrapment as a matter of law. Sherman v. United States (1958), 356 U.S. 369, 377, 2 L. Ed. 2d 848, 854, 78 S. Ct. 819, 823; People v. Andreano (1978), 64 Ill. App. 3d 551, 556-57.
In finding entrapment, the appellate court cited the encouragement of Boyne and Niehaus, and it found that defendant was not predisposed to commit the offense. As to this latter point, however, it seems apparent from our review of the record, and as argued by the State, that the appellate court relied heavily on a presentence report in characterizing defendant as an innocent, shy individual particularly susceptible to the urgings of an ex-girlfriend. Statements contained in the report, however, were those of an apparently sympathetic probation officer, were not before the jury, and should not be considered by a reviewing court and used as a basis for setting aside a jury verdict. Cf. People v. Morgan (1977), 69 Ill. 2d 200, 206 (preliminary hearing report improperly considered by reviewing court).
Viewing the evidence presented to the jury, we find no basis for setting aside its verdict. The jury could have found that defendant was predisposed to commit the offense, and it therefore could have rejected the entrapment defense notwithstanding the involvement of Boyne and Niehaus. In this regard, we note defendant’s admission that the idea to contact Steve J ones originated with him; that defendant telephoned Jones two or three times *488during his initial meeting with Boyne and Niehaus; that defendant said that he had taken acid and that his brother is funny when he gets him high; that defendant arranged a second sale for Boyne one month after the September 3, 1975, sale; and that defendant arranged a third sale for someone other than Boyne sometime after the September 3, 1975, sale. In sum, the evidence indicated to the jury defendant’s familiarity with drugs, his knowledge of a supplier, and his willingness to accommodate those desirous of obtaining drugs. This, we believe, is sufficient to sustain the jury’s verdict. The fact that Boyne and Niehaus repeatedly encouraged defendant does not require acquittal for “entrapment is not available as a defense to a person who has the intent and design to commit a criminal offense, and who does commit the essential acts constituting it, merely because an officer of the law, for the purpose of securing evidence, affords such a person the opportunity to commit the criminal act, or purposely aids and encourages him in its perpetration.” (People v. McSmith (1961), 23 Ill. 2d 87, 89.) Defendant points out that the State did not call its informant, Niehaus, to the stand or explain her absence; according to statements of defense counsel in the record, she apparently “fled to Kentucky.” As a result, defendant argues that the evidence of inducement is uncontradicted and that his entrapment defense should therefore be accepted. This argument, however, overlooks any consideration of predisposition, a factor which must be considered when the entrapment defense is raised (People v. Cross (1979), 77 Ill. 2d 396, 405), and any inference which might arise against the State because of its unexplained failure to call the informer would be of little significance given the evidence of predisposition placed before the jury (People v. Cross (1979), 77 Ill. 2d 396, 406-07).
The judgment of the appellate court is reversed, and the cause is remanded to that court to allow it to address other issues raised by defendant but not decided by that
*489court because of its disposition of the case.
Reversed and remanded, with directions.