In California it’s the sheriff and federal courts, they are Federal marshals I believe, but they don’t go house to house to collect ticket payments from blokes who make up stories about loaning out their car. They’re just the cops assigned to the court house or a specific court room.
More or less the same in Colorado. Federal marshals in federal court (which is mostly in Denver) and local sheriffs otherwise. Where I'm at has the Pueblo County Sheriff's department usually be assigned to courtrooms though sometimes Pueblo PD helps out. (All courthouses in Pueblo county are in city of Pueblo.)
In California they’d just mail you a huge fine and the threaten to quadruple it if you don’t pay by such and such time. (I believe they suspended the whole red light ticket collecting for awhile, not sure currently). But if your not the driver or they can’t see you clearly your off the hook. So muslamic bitches with burkas and those Asian cunts who drive with sun visors over their faces are immune.
In Colorado if they mail you a ticket, they can't force you to appear in court or send a warrant for your arrest since it can't be proven you received it. It's tantamount to extortion, nothing more.
Most stuff has an actual court summons given to you BY an officer and if you ignore that, then a warrant goes out and/or the fine grows.
And speaking of red light cameras, there's a bill in the statehouse with bipartisan sponsorship to prohibit such things. It narrowly failed last time it was there but public and political sentiment isn't very keen on keeping or expanding them. Colorado Springs wants to try it out but they may very well end up shut out before they do anything.
Personally, I find red light cameras to be unconstitutional and downright criminal to be used. They are nothing more than warrantless surveillance, a denial of due process and an extortion scheme to bilk people of money. (As President I would put a nationwide ban of red light cameras, no exceptions.)