This is total, corrupt bullshit. How the fuck is a traffic cop supposed to ascertain the origin of the money in your accounts, let alone if it was from the "the commission of a crime?"
If you seem suspicious, or if they claim so, then your money suddenly is not yours any more, until you prove their source. If you can't prove the legitimity of your money, they become fair game to be confiscated. In this whole process you personally are not charged with anything, but the confiscation is triggered by their being suspicious about you.