Just finished Malcolm Gladwell’s book “Talking to Strangers” (thanks for the rental @CraigT78 ). His conclusion is the resulting crime prevention may well be worth the intrusion to liberty..."
This is the balance the courts have studied in search and seizure cases. The court recognizes that extending the stop to ask questions or to search is an inconvenience to the person stopped, but the benefit (stopping the flow of illegal drugs and finding guns, stolen property and fugitives) creates a greater benefit to society and even to the person stopped.
Police officers who focus on this type of interdiction skate on a thin line between vigilence and harassing the public. When they find a ton of heroin, a fugitive terrorist (Tim McVey) or a kidnapping victim (Elizabth Smart) they are heroes. When they delay an innocent person who is acting strangely (to them) we're ready to say they are bad cops violating people's rights.
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