Originally Posted by LEX-LGA Commuter

It requires nothing of the kind. You, as the employee, agreed to abide by the rules when you took the job. Don't like it? Work somewhere else.

But, more importantly, the courts have upheld that you have no expectation of privacy on company equipment, again as stated and agreed to at the time of employment. If you don't understand the implications of that, you need to. In fact, everyone needs to. Hopefully this will explain it better than I can.