Just because someone identifies themselves a cop doesn't mean they are one. It's not unheard of for BG's to break into a house pretending to be cops conducting a raid.
Yeah, I understand it's picking up in frequency. Add that to the villains painting the ends of their "gats" orange and it's a perfect recipe for all kinds of the wrong people getting shot.
What is the criteria for a no knock, anybody know?
Convince a judge the suspect will destroy evidence.