Nope...sorry. An "arrest" is the process by which a person is taken into physical care and custody of the state, for whatever purpose. It is possible to present for booking, and to post bond (assurance to appear at some future time and place), without having been formally "arrested."
Don't kid yourself -- he was arrested, and he's copping a plea.
You can think what you like. I worked for a criminal defense attorney and worked with the police and the District Attorney's Office and have great familiarity with criminal law. On this particular matter, however, prior to posting, I read the statements call a friend who is a sheriff and read them to him. According to this police officer, if what the statements in this article state are factual and true, Rush was arrested.
I have been informed years ago that any time someone has had a warrant issued, had a mugshot taken, fingerprints taken, and/or bond set, they are arrested, regardless if voluntarily appearing at the police station after the warrant is issued and regardless if placed in jail.
I personally know many people who have been "arrested" after voluntarily going to the police station and, aside from the charge, everything was EXACTLY THE SAME AS WHAT HAPPENED WITH RUSH: booked, fingerprints, mugshot, and let go on their own recognizance. They were "arrested" and the judge later issued an order that would dismiss the charge on an adjournment in contemplation of dismissal (ACD).
Why? You're wrong about the matter and can't even admit it.