This is also the reason that immigrants became "illegal". If they are legal you have to pay them a real wage/benefits/pay taxes for them. If you make them "illegal" you can have very cheap labor (slaves) that can't rat you out or they are deported. They also only give corporations a slap on the wrist when they "had no idea they were illegal". Then the corp just replaces them with "new hires" who are totally "NOT illegal" and starts the process all over until the next time.
" Am I being detained or am I free to go?" If detained "then you shut the fuck up!"