They don't have to. They could use union government employees to do all that. It's not like they're very busy. But instead of a 50% loss of ticket revenue, it would cost them 200% of revenue.
I’m sure if we looked at the lobbying for these red light cameras from coast to coast, we’d find some politically connected individuals profiteering off of this scheme.
Here in Houston, the police bought some bogus “drug detector” that looked like an ACME device from a Wiley Coyote cartoon. No, seriously you put in a “card” and it would detect for that substance. It was just a box and some do-nothing wires. They used it for drug searches in schools. The vendor was somebody’s son or brother. I believe that the FBI got involved in busting that racket.