- Random frisking in security is a technique used for deterrence and detection. It involves selecting individuals from a flow of people for searching based on a method that is unpredictable to the individual being frisked. - This unpredictability can be achieved through various means, including truly random selection mechanisms or systematic sampling like checking every Nth person, provided the pattern isn't easily predictable or is varied. - The key is that the selection is not based on subjective criteria like appearance, behaviour (unless specific alert criteria are met, which would then fall under targeted search), or any form of discrimination.