Most important, police department supervisors at all levels find that marijuana possession arrests are very useful. They are proof of productivity to their superiors; some supervisors also receive overtime pay for the extra work by officers under their command. Making many searches and arrests for minor offenses is also excellent training for rookie police. If a new officer screws up the paperwork, it doesn’t matter because, as one sergeant explained, “it’s just a pot arrest.” And if a crisis or emergency comes up, police commanders can temporarily reassign officers making arrests for marijuana without hindering an ongoing investigation. This “reserve army” of police focusing on petty offenses keeps officers busy, provides records of their whereabouts and productivity, and gives commanders staffing flexibility.