The form that is used in the state of California to file for a mistrial brief is the manifest necessity. The most common cause for a mistrial is a hung jury.

Yes, a mistrial does not mean he was found not guilty.

Defendant's do not declare Mistrial. A mistrial is when there is a error in the court proceedings and therefor must start over with a new juror, etc. Judges declare Mistrials.

There was no mistrial. The trial of Casey Anthony was completed and the jury delivered their verdict on July 5, 2011.

Yes.