>> it was in andy wegener's name. >> reporter: yeah. >> but there it was in david moffitt's house. >> reporter: that is, the bill of sale for a 9mm carbine. and the name on the document, bold as brass, was indeed andy wegener. how was that remotely possible? it's more evidence to suggest that there's some sort of conspiracy involved here. >> it's too early to really rule anybody out. 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?