I've actually never seen that. Heh. Not that I care about my detainees. Yes, they can't be prisoners, because then there are legal restrictions that apply. I can torture <Cough> I mean, motivate my detainees.
As long as they ignore the semi-caustic vapors in the research lab, keep brewing potions despite the mostly rare accidents, (Who needs alchemy level 2? Brew it again!) keep sweating at hard labor building my huts, and keep up the farming, (We don't have a faction level 2 for a shark potion? So, you'll have to swim fast, won't you?) I'm mostly satisfied.
Since CFII is here, though, I will renew my plea for salt mines, in VV4.