for others to exit, to enter. Passenger height Passengers may be unaware of height guidelines determining when children must begin to pay, which were posted at booths that many customers no longer use. Prototype signs are being tested near turnstiles at the Bowling Green station, and a sign also exists at the 81st Street–Museum of Natural History station. Vandalism MVM vandalism costs MTA both in lost revenues and repair expenses. MTA provides MVM vandalism intelligence to NYPD, which utilizes hidden portable wireless digital video cameras in “sting” operations to gather evidence against organized fare abuse rings and identify leaders. These “professional swipers” can be difficult to apprehend because they are very mobile and require strategic and determined law enforcement efforts to monitor MVM vandalism patterns, prioritizing stations with the highest vandalism rates. In years past, theft-of-service crimes were often dismissed with time served (several days in Riker's Island), but by working with the Manhattan District Attorney's Office and Midtown Community Court, FATF achieved escalating sentences for recidivists. The coordinated efforts resulted in a five-swiper ring being disbanded and sentences of over one year being imposed. Measuring impacts of taking down fare abuse operations is difficult, because even large swiper rings ‘sell’ very few fares compared to natural day-to-day fluctuations of the 8.0 million riders on NYC's system due to reasons like weather or special events. Legal framework and enforcement The most important evasion fighting tool is arguably comprehensive and functioning legal frameworks to deal with evaders and counterfeiters. MTA's Rule of Conduct (62) has banned evasions since the 1980s, rules having been established mainly for arresting persons likely to commit other crimes (assault, graffiti). With appropriate legal framework, like traffic stops, evasion checks can be effective in identifying and arresting criminals wanted on outstanding warrants. To round-up evaders, MTA fare inspectors continue to use the “surge” strategy first developed by Transit police. Renewed enforcement interests led to several high-profile cases. Swiss tourists with allegedly valid passes were ticketed for bumping turnstiles. One passenger was arrested for exiting through an emergency gate, even though he was not evading a fare. Legal framework is more than prohibition of illegal acts and prescription of fines. Complete regulations should address issues like: arrests versus summonses; arresting/summons issuing powers; whether undercover enforcement is permitted; disputes/appeals process (e.g. “my monthly MetroCard isn’t working, so I went through the gate”); dealing with genuinely confused tourists (e.g. “I