Yeah this just for reasonable cause cases where someone got caught cheating or there was reasonable cause to think they were cheating. But eventually all truck drivers will probably end up being observed. Its another one of the lies our government spreads around with the help of the media. The usuage of drugs in truck driving is so small anymore as to be almost insignificant. Was all lot more drug use in trucking 30 yaers ago before they finally passed some hours of service laws so you didin't have to work 22 hours a day.