Dos machine using USB

In a discussion with one of my techs the subject of DOS and USB came up. I said I remember using a USB device connected to a machine running DOS. He sait that was inposible and has since sent me several articles confirming his point. I am old and have been arround since way before the IBM PC (which I was factory trained on) and I think I had USB running on a DOS machine.

Can anyone help me out with this, an old mans prid is at stake?