What does TSA stand for?

** Got this at the tail end of a trip report:

[My] carry-on bag is the same bag used to transport food and dishes to the boat during the summer. In an inside pocket, we discover that a steak knife has traveled to and from Chicago, totally undetected, however a sealed 12 ounce jar of pumpkin butter was confiscated. Also, [Companion] passed through security twice with a lighter in his pocket.