Terry v Ohio gave police the power to do this. What Hillary is unwilling to admit is that it does work in certain areas of a city. NYC pushed this heavily to reduce crime. Groups say it targets minorities…which it can. Hillary should have mentioned it being unconstitutional (NYC ruled on this).
I’m not fond of the stop and frisk due to our 4th Amendment (unreasonable search and seizure). Our Supreme Court has allowed it through their rulings (Arizona v Johnson allows a pat down during a minor traffic violation).