
Quoting
jupiterskye
In your post, you boil it down to two simple questions, so I will offer two simple answers:
"Shouldn't my parents have been contacted?": Yes
"Can the police do that?"... the answer is apparent...
what you should have asked was "is this lawful?", in which case your gut is probably telling you the truth, which is the same answer to question number two... the answer is no.
Laws are just words on paper. If you can type, you can read. There will be a law library somewhere near you, or at least a state codes section at your local library. My suggestion, start with your state code 1.00000001 (example), and find out for yourself. Chances are, you'll find that prior to your brother being arrested, there were a great MANY laws broken by your local arresting agency in order to even BEGIN the process of arresting him. The more you know....