I don't know, there's some of these myths that have been carved in stone.
The police have to read you your rights when they arrest you, or they have to let you go is another one.
Then the old possession is 9/10Th's of the law still gets tossed around. Although today people only seem to apply that to when they have stolen property so it becomes theirs, not when they're holding someone else's dope.
Then you have the group that will refuse to obey an order while they scream, "I know my rights" and don't even stop when they're in handcuffs, being dragged to the black and white, only then they scream, "You can't do this to me". Then the pepper spray comes out. But that doesn't stop them, because they still have something else to scream, specifically, "I'll have your badge for this!"
I actually witnessed this happen to a guy who was arrested for trespassing! He claimed he had a right to be in a public park (drunk as a skunk) and he wasn't going to leave and they couldn't make him, yada, yada, yada.
It was the most entertaining day at the park I ever had!
I don't believe the police ever read him his rights either,,,, well, I have heard pepper spray referred to as "Your Rights in an Aerosol Can" so if that counts he received his rights a couple of times!
But I have often wondered if he ever got anyone's badge????
But I don't think that's ever happened, so I kinda doubt it did in his.