Motor Carrier Officers (MCO) enforce laws related to commercial vehicles. This deputy's job is setting up portable weight inspection spots, inspecting the mechanical safety of trucks, making sure hazardous loads are properly packaged, and that other loads are secured properly. The MCO enforces Oregon Revised Statutes and Oregon Administrative Rules, as well as the Federal Motor Carrier Safety Regulations. The MCO is a Federal Motor Carrier Safety Administration (FMCSA) North American Standard Level 1 Motor Carrier Inspector, accredited by the Commercial Safety Alliance.
In the 1970s, Washington County Land Use and Transportation transferred its equipment and funding for inspecting commercial trucks to the Sheriff's Office and deputies were specially trained as Motor Carrier Enforcement Officers. As funding decreased, the number of deputies was reduced to just one in the county. Although many agencies have part-time Commercial Motor Vehicle (CMV) inspectors, the Sheriff's Office currently has the only full-time police-certified inspector dedicated to commercial vehicle enforcement in the metro area.