Originally Posted by
adamnawroc
I think cops can hold you in custody without arresting you. If you ask them if you're free to leave and they say no then you're not free to go. An example would be being stopped for a minor traffic infraction but then a cop smells marijuana emitting from you car. While he searches your car you're not free to leave.
When in custody you can't get up and leave but you do have the right to remain silent. I'll do some research in the coming days to verify this.
EDIT: In custody = being arrested. So, you can tell them you don't want to talk anymore but you won't be able to leave until they let you.