What percentage of armed gunmen walk swinging one arm but not the other?
*580What percentage of citizens who walk swinging one arm but not the other are armed gunmen? How, if at all, do these percentages change based upon the time of day or the fact that it is a high crime neighborhood? Similarly, in a police encounter with a citizen, what percentage of the citizens turn their bodies away from the policeman? And of those that do, what percentage are hiding something? And of those that are hiding something, what percentage of them are hiding firearms?50
In addition, the court stated, or at least suggested, that the officer's testimony was not admissible under Delaware Rule of Evidence 702 because it was not "based on sufficient facts or data" or "the product of reliable principles and methods."51 When an officer testifies about something he has learned through his police training or through his police experience, however, a court cannot expect the testimony to be supported by a statistical analysis or a scientific study where there is no evidence that such an analysis or study exists.52 "[T]he determination of reasonable suspicion must be based on commonsense judgments and inferences about human behavior,"53 and such a determination "need not rule out the possibility of innocent conduct."54
Our good friend in dissent contends that an officer who sees someone engaging in furtive, odd behavior indicative of carrying a weapon cannot make a stop unless the officer has a reasonable suspicion that the person does not have a license to carry. But, of course, if a person has a legal right to carry a concealed weapon, that person has no need to act like someone in possession of illegal contraband. If police officers are to help protect the public from gun violence, they must be able to make reasonable inferences from unusual, awkward behavior uncharacteristic of people who have a legal right to possess a gun.55
IV. CONCLUSION
For the foregoing reasons, the judgment of the Superior Court is reversed, and the case is remanded to the Superior Court for further proceedings consistent with this opinion.