The actual laws are just as decentralized as the law enforcement. Speed limits are a state/local law. While many of them are similar, enforcement varies great

The actual laws are just as decentralized as the law enforcement. Speed limits are a state/local law. While many of them are similar, enforcement varies greatly, and there is a propensity for corruption, as we see in the article. I remember a few decades ago, AAA (large US auto club) recommended against using certain stretches of highway in Florida because the local town loved to ticket out-of-state drivers (heading from the northern border to Disney World in Orlando, IIRC). And because enforcement is decentralized, so is enforcement of police procedures. "Thin Blue Line" is the term used to describe cops backing cops, even when they do illegal things. Like planting evidence in Baltimore (a few news worthy cases over the past several years). Basically, policing in the US is completely broken. And the Supreme Court has decided (not recently) that police have zero obligation to actually help and protect citizens. So, if a crime is occurring, the police aren't obligated to help. They just wait until the beatings and rapes finish, then maybe arrest suspects, if they can be bothered (ie, did the crime make headlines and is a politician pressuring them to do so).