Is it possible for your bac to drop rapidly?

The other night me and a couple buddies picked up a breathalyzer from the store. I had already been getting after it a bit but when we got back I decided the best way to test it out was to put away 3 shots of Jack and wait the 20 minutes to see where I was at. I got a .05 and waited an hour to see if anything had changed. After only an hour of waiting my bac was 0, and I’m wondering if that would even be possible. All of the other people there blew accurately, but even after numerous tests it would still read 0. I do have an incredibly fast metabolism and work out very regularly but even still, I’m just not sure if that could even be possible. I will do some more tests this weekend and see if it could have just been a fluke but in the meantime I may be immune to breathalyzers 😂