There is an old quote where a bank robber was asked why he robs banks. He replied, “Because that is where the money is.” It seems that the police have decided to take his advice and begin robbing the modern day version of the stagecoach. The Feds are helping them.
Sheriffs in California and Kansas have exploited the fact that marijuana distribution, while legal in those states, is illegal under Federal Law. Because of this fact, they are having deputies conduct traffic stops on the armored cars and confiscating all of the money. In the case of Kansas, no law is being broken in Kansas. The cops are merely stopping the armored cars that are transporting the cash from Missouri pot shops to Colorado banks.
As soon as the money is seized, the cops turn the money over to the Feds, which places it out of the jurisdiction of state judges, who are then unable to intervene. Under Federal forfeiture laws, the local cops get 80% of whatever the Federal government confiscates. Getting $800,000 for a traffic stop is a pretty lucrative business move.
This is purely an attempt to use badges to conduct armed robbery. The cops want people not to oppose them, but that is pretty hard to do when you are acting more like a criminal gang than you are a legitimate law enforcement agency.