They always arrest the drivers but do they EVER go back to the facility that loaded the trailer, likely where the contraband was put on? I imagine it could have been put on anywhere as well but logs would show where they stopped, but that would take real police work, time & effort, so these 2 take the fall and the drugs just keep rolling in anyway, and the cops pat themselves on their backs for a job well done, meanwhile all they did was temporarily stop the flow. I doubt these 2 were the masterminds behind the operation, or had any intent to distribute.