Arizona forced residency - coronavirus non travel?

I read in the Arizona driver's license handbook that one is considered a resident after seven months. Nine months is new to me.

I know of no way for AZ to enforce it. My guess is that one would have to have a complaint filed against them, be in some kind of accident, lawsuit or extended medical stay.

It could also be to prevent cross-border sales tax evasion issues. That law is on the books for a reason - but probably not for law abiding temporary visitors.