>magine if the postal service was charged with filtering any potentially illegal activities. The Postal Inspection Service _is_ tasked with filtering stuff tha

>magine if the postal service was charged with filtering any potentially illegal activities. The Postal Inspection Service _is_ tasked with filtering stuff that is prohibited from the mail, such as child porn, illegal drugs, and nuclear weapons. While the USPS isn't responsible for illegal stuff that happens through the mail, they do have a whole law-enforcement branch to deal with it.