Good cops are very adept are reading postures, expressions, movements, always looking for unspoken hints of what people are doing and thinking as they walk down the street. Is he sweating, can he maintain eye contact, where are his hands and what are his fingers doing? Bad guys are clumsy about guns, even if they don't have them in their hands.
But S&F lets them act on these hints, legally.
[[Good cops are very adept are reading postures, expressions, movements,]]
All that gets thrown right out the door though when they confront mimes- then it’s anyone’s guess what their expressions mean