we wanted to find out if andy was the actual purchaser of that weapon. fortunately, that bill of sale gave us the lead to where the weapon came from. >> reporter: his name was right here -- drew bahlmann. and here he is. he's a small-town high school english teacher in a little place called sigourney, 90 miles or so from des moines. there is something you can do with a degree in english then? >> yes, there is. yes. and i love my job. >> reporter: an english teacher who likes to tell stories. and this one? sort of thing that would make an interesting plot for a novel, wouldn't it? >> for a novel perhaps, yes. >> drew is a self-described nerd. he also is a target shooter and a metal detector enthusiast. he's forever digging up old coins and such. loves it. mind you, there's only so much a person can ferret out using equipment that's -- well, to say "down-market" may sound cruel, but --