Right from mouth of TSA. http://www.tsa.gov/who_we_are/workforce/workforce_stories/catch_100110.shtm The Things Passengers Bring Workforce Stories When is a pen not just a pen? The answer is when it doubles as a potential weapon. A TSO at Palm Beach International (Fla.) was working the X-ray machine when he came across an anomaly on the screen and called for a search of a passenger’s backpack. Inside, the responding Officer discovered a tactical pen, used commonly by law enforcement as a defense tool with its sharp aluminum-based point on one end and blunt portion on the other. A Supervisory TSO confirmed that item was a prohibited item. The police responded and issued the passenger a criminal summons to appear in court – under the state statute – for carrying a concealed weapon. He was cleared for travel and there were no flight delays.