No matter what....you can't bring any kind of weapon on a plane. IN South Carolina, 51 year old David Angell was attempting to board a flight when TSA found some things that didn't belong. In Dave's carry on he had three smoke grenades, a set of plastic stun knuckles, three stun batons, two knives, and two cans of pepper spray. They didn't like that so much so they brought the FBI in and arrested he man. He's been charged with knowingly and willfully entering into an airport area in violation of security requirements. If found guilty, he can face a year in prison.