Stop putting them in prison!
Put them on display in zoos, instead. Why bother maintaining lions and tigers and bears when criminals provide twice the entertainment for a quarter of the costs? You could even show off the one model inmate... he's made entirely of PVC and so he never causes any trouble.
If you want to pick THAT type out of a crowd, just look for the festering scabs on their elbows.
We could turn them into gladiators ancient roman style.
Here in Cloud Cuckoo Land, there are no rules: There's no government, no baby sitters, no bedtimes, no frowny faces, no bushy mustaches, and no negativity of any kind. And there's also no consistency.