the one Thendria grabbed when she was ducking behind a building when the tanks were starting to shoot at her
it's a war, there's no such law as of yet, and there is some slight chance that a couple alareen might have a view a little close to seeing them like that, but as a general rule, any captive must be taken care of according to the whim of the highest ranking officer that is present. Just about any of them will have such a level of respect that none of them would ever lock up a human on its, and it would be much easier to simply assign the POW a caretaker to watch him or her. after all, it would be quite a trick for a human to get down uninjured from a twenty foot dresser or bed