Kraken,
i've thought about this, after picking some mexicans up in the home depot parking lots...
I never seem to find the hard working and (hung) ones again the next day
my idea would be a electronic collar like a dog wears....
so if whe n we an own them again, we can zap them for disobeying and trace their location...
but say they work for 16-20 hrs and its time for them to eat, and poop, and sleep...
you let them do that on their time for 3-4 hrs...
so they go and find a bridge or subway or whatever, beg for food, rob a liquor store whatever...
who cares, just as long as you don't have to share the same air their unproductive mouths are breathing
but then when you want them back the next day you press a button on your remote for the collar and it zaps them and lets them know they have 60 mins to report back to work or wherever before a sustained painful and possibly deadly electical current will be run through their neck collars...
also penile collars might be good too