Would you be surprised to learn that it is legal for the State of Nebraska to steal cash from you without convicting you of anything or even charging you with a crime, and without any legal due process? All the government needs is a "belief" that the cash was gained illegally. They don't need proof, and they don't need to take you to court. They can literally gather up your money and walk away.
Which is odd, because I thought there were rules about that sort of thing.