Earlier quoted context omitted.
A bit more clarification. Miranda isn't ever required , however anything you say to them before having been read you rights cannot be used against you in court, nor can evidence acquired as a result of what you said (with exceptions for both cases).
A bit more clarification still: Anything you say to them while in custody cannot be used unless you have been Mirandized.
Dudes, seriously? You just read a blog post about how thuggish police officers just abuse you however the fuck they want to, with no regard to your rights or due process or anything, and you're citing some obscure, minute details of the laws that were supposed to somehow prevent those very same abuses from happening?
It's like you've just seen fish swimming, but proceed to cite some obscure document that says fish cannot swim.