Can anyone think of any other ingress and egress services?
This reminds me of the building in Sydney’s CBD that introduced facial recognition to curb overcrowding. All well and good until one woman grabbed her husband’s keys while she went out to buy milk. The computer image trieggered by the key didn’t match the one on its camera and not only was she locked out, but the system cancelled the key too.
In any case, residents must be able to allow visitors into the block, which would bypass any other constraints and efforts to curb that would probably be breaches of the law, as mentioned above.
A big CCTV warning sign would, I think, be a pretty effective (and inexpensive) deterrent for the clients and courtesans alike.