This is
Corporate America. You're assuming that
working for a corporation is like being a
citizen of the
United States. It
isn't. Working for a large corporation is effectively like
living under a
totalitarian government for eight hours out of every
day.
In US Law, you are innocent until proven guilty, for legal proceedings. You have a certain right to privacy. When you sign on with a corporation you sign at least a portion of that right away willingly. If you don't agree, they can't test you for drugs, but if you don't agree, you can't work there.
Just one of the bummers about working for the man.