In the first month of FY 2019 (i.e, Oct 2018), FMCSA closed 261 enforcement cases against motor carriers, with 76 of the cases (29%) involving hours of service-related violations and fines. The top 3 HOS violations were: (1) no logs; (2) false logs; and, (3) no supporting documents on file. In all of FY 2018 (Oct 2017 – Sept 2018), drug and alcohol testing (D&A) violations were the most frequently cited violation in the 4,660 enforcement cases made by FMCSA against motor carriers. 46% of the enforcement actions involved D&A testing violations. Where did hours of service violations rank? A distant second at 33% of the cases. (STC analysis of FMCSA enforcement case data found at