I was sort of let down when I saw that they got to go home at night.
I'd agree. IT's not a very good study (well, that can be taken in general, but) if the participents do it from 9-5. Even, PBS allow participants to be there for three months, adding realism.
I did find this to be upliffting, though
"Zoo vets haven't ruled out using tranquillizer darts if the humans misbehave."