In 1987 I was in a SUV with 5 other people heading east on I-10 and we got pulled over in Van Horn, TX. They cited everyone in the car for seat belt violations for $50 each and the diver also got a citation for speeding. They told us we could spend the night in jail or pay the fines by mail. The officer watched them out the citation with a check in a stamped envelope and watched them put it in the mailbox before we could go. Total speed trap scam.
I didn't get a ticket because as we were being pulled over I put my seat belt on. My fellow travelers were pissed that I didn't get a ticket.
In 1983, I had to give a cop in the DFW area cash to keep from going to jail for 65 in a 55. Everyone was going 55, but I had CA plates.