Is an 3 year old unserved warrant legally a warrant?
Yes, old warrants are still good. One wonders how much the witnesses remember of the event. What is odd is the police claiming, several times, that Metcalf was doing nothing illegal, so they could not arrest him for exercising his constitutional rights, while all the time this warrant for his arrest was available.
Metcalf was served the warrant when he was taken to the City Court in the Yellowstone County Detention Facility, as I understand it.