The sh-t may be injected by syringe through the edge of an envelope!
The edge of a *paper* envelope with obvious seepage marks by the time it arrived. Just because it's sealed in an envelope doesn't mean it can't infect someone.
On a side note, I heard from ABC News that Publisher's Clearinghouse has sent out contest entries with packages of *laundry detergent* included. They are worried someone's letter might open and have the contents spill out, causing someone to come unglued and call the police.
Wonder which cleanser's name is on the package?