Observe, think, respond.  Do what is right.  Stop and frisk is as effective as a blind squirrel.  Even a blind squirrel finds an acorn once n a while, if he/she keeps looking.

"12 years of data from New York City suggest stop-and-frisk wasn’t that effective" 
By Emily Badger
August 21, 2014

https://www.washingtonpost.com/news/wonk/wp/2014/08/21/12-years-of-data-from-new-york-city-suggest-stop-and-frisk-wasnt-that-effective/

Be aware!  Beware!