There is a driver shortage in the trucking industry and finding drug-free drivers could be adding to that issue, especially for those states who now allow the usage of marijuana. One of the main concerns in this industry is safety, and having unimpaired drivers is vital to that safety.
The full news article can be read here: https://www.saukvalley.com/2019/06/13/legal-pot-makes-truck-driver-recruitment-harder/a2i5slm/