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It's truly amazing what some people will try to carry on to a plane. Most of the knives, power tools, scissors, etc. are resold by the TSA at state-run stores like the one in Harrisburg, Pa.
Baseball bats are not permitted on planes. Not even if it's a pink, miniature souvenir. Not even if it's signed by A-Rod. They're blunt objects and therefore deadly weapons, says the TSA.
Play-Doh is also prohibited because it can conceal an explosive.