It just depends on the jurisdiction and some other intangibles. In some places, Out-of-state plates = Ka-Ching!
I get away with stuff now that I'm fifty that No cop would allow an 18 year old, but my last ticket was at one one those state cop jamborees- you know, airplanes overhead, a dozen cruisers, upper echelons in command. A Chubby-fest.
Knowing how to play the game, I pulled over, shut down, turned on the flashers, and had both hands on the wheel as he approached, with license, registration and insurance card between my fingers.
After the usual intros, he said that he'd have to ticket me for speeding, and headed back to the cruiser to fill it out. When he returned I saw that it was for 5 over.
I said "I can't believe that I'm getting a ticket from a State Patrolman for going 5 over."
He said "I can't believe it, either, sir, but there are Pricks in charge today. Sorry about that."