The weirdest items TSA agents are trained to catch when they scan your bags.

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The Transportation Security Administration, the federal agency in charge of screening airline passengers, is perhaps best known for its rules concerning toiletries, laptops, shoes, and metal objects. According to training materials recently released to INSIDER under the Freedom of Information Act, however, the agents of its sprawling workforce are periodically trained, with PowerPoint slides, to detect and assess threats posed by an increasing number of uncommon carry-on items, including reborn baby dolls, prosthetic devices that mimic pregnancy, and homeopathic devices. Compiled are 15 of these rather unique items below, and you can read the rest of the training materials here.
These materials are public record, but certain portions of them have been withheld or redacted under a US law, incorporated under exemption (b)(3) of the Freedom of Information Act, that prevents the release of records whose disclosure "would be detrimental to the security of transportation.
Zappers are "a homoeopathic medical device designed to induce [an] electric current into the body to destroy pathogens." Subsequent slides describe Zappers' superficial resemblance to improvised explosive devices or IEDs.
"Wristwatches with a hidden butane lighter function."According to this slide, the FBI and Department of Homeland Security came across evidence that members of the terrorist group Al Qaeda were seeking digital wristwatches that double as butane lighters. The next slide, though, says "the FBI and DHS have no specific information indicating plans to use lighter watches."
Switchblade lighters: Another banned object that features a hidden lighter switchblade lighter incorporate a concealed blade and a butane lighter. They're also banned from carry-on luggage.
Belt buckles can be used to conceal blades. Because they contain sharp objects, belt buckle knives cannot be brought into the cabin of a plane.