It would seem that such a hypothetical level of policing is taking place inside actual prisons, and yet violence and contraband run rampant. If it isn't possibl

It would seem that such a hypothetical level of policing is taking place inside actual prisons, and yet violence and contraband run rampant. If it isn't possible to eliminate crime amongst already incarcerated people, what suggests that an arbitrarily high level of policing would eliminate crime amongst the wider populous? Especially when such levels of policing would almost certainly approach something akin to imprisonment?