So what happens to these things?
In the last couple months, the TSA has seized 30 to 40 pounds of these banned weapons or replicas.
Everything from guns, knives, brass knuckles, and that's not all.
"Here's an interesting one, an old farmers mallet. Now, i don't know what the person was thinking, i don't know if they thought they were going to bring that on board but..." said Bruce McDonald, Federal Security Director at Burlington International Airport.
Shockingly, it's a little less obvious.
"Here is a key with a knife in it. It was designed to have a knife in it and that was a pretty good catch, not easy for our officers to detect," said Lisa Farbstein, a TSA Spokesperson.
The TSA collects anything it presumes to be dangerous at checkpoint on a daily basis.
All of these items are voluntarily left behind, from passengers boarding flights out of the Burlington International Airport.
Usually, when they find items, it's because people often forget it's in their bags, but other times, there's a situation like this, "In some cases I think they were intentional. For instance this gun, when it was found, it was on 3 different passengers, in 3 different pieces.The cylinder, the barrel, and handle frame, so indeed there was an attempt to sneek that through. Most of theses are just left in a bag and they forgotten about it," said McDonald.
If you're unsure about an item, well there's an APP for that.
It's called "Can I bring my?"
Made by the TSA.
"It basically gives you guidence, whether you want to take that in your check bagagge, and you have to make that decision, do you want to pay?"
Here's how it works, "Somebody asked about knitting needles, and it will tell you immediatley if you can bring it in your check baggage or carry on, either or neither," said Farbstein.
We tested it out with one airport passenger.
Rafa Ruiz-Coss looked up lighters, "Passengers are limited to two fuel lighters in checked bags."
He found it helpful, "I thought that because of the lighter fluid you couldn't bring them."
TSA officials said you shouldn't leave home without it.
Anything seized at checkpoint goes to the State Surplus Agency.
The TSA does not get any profit from the sales of these items.