While passing through airport security recently, an 80-year-old South Carolina woman submitted her cane to be screened.

Inside, a TSA official said Thursday, they found a hidden sword, according to WYFF.

The woman, who was not named, apparently knew nothing about it, and was let go, while the cane was confiscated, Mark Howell, a TSA spokesman, told the station. Howell added that the incident was a reminder that hidden swords in canes might be more common than you think. 

That’s because they are frequently purchased secondhand, officials said, which means that there could be thousands, if not tens of thousands, if not hundreds of thousands—or even millions?—of cane users worldwide, who are, quite possibly unwittingly, armed for battle.