obviously none of you have ever been arrested and spend too much time watching television.
The police can essentially do whatever they want to you, short of beating the shit out of you (which they can if they feel their safety is being threatened). You can be put in cuffs and not arrested, same way you can be arrested but not put in cuffs.
I am not totally sure about the states, but in canada you don't have to be read your rights.
'uhhh.... i figure since we will probably never meet then its okay to talk about balls. - Kamikaze