Okay, let's stop splitting hairs. Can you provide any "credible" proof that Zimmerman was "officially" arrested on the night of the shooting? Again, how can one be formally arrested and not charged with a crime?
In the interrogation tapes the officer you spoke of told him he was not free to leave. That is arrest. When you say "officially" you me charged. Would you consider yourself under arrest if your hands were cuffed and you were in a squad car being transported to the police station?
Yes, Zimmerman was cuffed on the night of the shooting, and the lead police investigator, Chris Serino, wanted to arrest him - but was overruled by the state attorney's office. Therefore, Zimmerman was not formally and officially arrested or charged. There was no arraignment.