This Strikes Me As Un-Constitutional ... Silly Me!

SEE HERE  So what the hell is this all about?  The government is demanding that FedEx and UPS police the contents of sealed packages?  Just how is that supposed to work?  How is that legitimate?  Do citizens have no rights anymore?  This is simply an outrage.  How is a shipper supposed to know that the contents of a sealed package is legal?  FedEx and UPS are not arms of law enforcement.