Indeed. The city I live in has this random-fare-inspection system, and considered turnstiles. The study's result was surprising: the additional fare from mandat

Indeed. The city I live in has this random-fare-inspection system, and considered turnstiles. The study's result was surprising: the additional fare from mandatory inspections was much lower than the capital and ops cost. Of course, this depends on an overwhelming majority of people being honest. Obviously "not having too many unauthorized riders" is a very different objective from "only allowing authorized access and refusing all else".