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COMPUTERS AND EXTERNAL HARD DRIVES
You might be surprised by how often TSA agents find items concealed in the guts of a computer or external hard drive. In 2012, TSA agents in Jacksonville discovered a knife in a computer; the traveler, who had rented the device, taken it apart, and put it back together, didn't realize he'd left it there. The situation, Bob Burns wrote on the TSA blog, was "similar to when a surgeon stitches a scalpel inside a patient."
That was an accident, but many other incidents can't be explained away, like a 2-inch knife concealed in a laptop between the keyboard and the screen; a 3-inch knife found in a laptop's hard drive at Dayton International Airport; a knife hidden in an external hard drive; or a loaded 9mm handgun held in place inside a computer with duct tape and modeling clay.