Jeff Clark, contributorJeff Clark CalAmp's is senior vice president of product management. Top StoriesSafety & ComplianceFeds reclassify marijuana, still banned for truckersMarijuana, which accounts for nearly 60% of all positive drug tests among commercial drivers, remains a prohibited substance under 49 CFR Part 40.TechnologyHow weigh station and toll bypass tech help fleets save on fuel costsSafety & ComplianceLawmakers press HHS on drug testing standardsSafety & ComplianceAvoiding ELD violations: 'Details are always your friend'Featured SponsorContinental's Extreme Duty Multi V-Belts designed for extreme temperatures