It’s a little-noticed legacy of post-9/11 airport security procedures: the brisk commerce spawned by the buying, selling and disposal of the 30 million prohibited items surrendered by passengers at checkpoints.
Some of it is hazardous waste, like Chemical Mace, and is disposed of accordingly. A small portion is pure junk and gets discarded. But scissors, cigarette lighters and pocketknives have value. And, this being the USA, a lucrative market has sprung up around the buying and selling of surrendered items.