Delko stops by Horatio's lab to talk about how hard Speedle's working. He then mentions the disposable cameras, which he's hot to get developed, because nothing says "pure sex" like a tweaked-out addict who hasn't eaten since God knows when or bathed for days on end. Horatio, however, is all over the cameras. He notices the cameras, tests one to see if it works, then notes, "Susie says she and Chaz were up for five days at Darwin's, but by day four, Chaz had run out of radios to fix. Now, disposable cameras like this one run off capacitors that are powered by batteries, right? But in this case, our bomber placed a nail opposite the flash button right here, so when Eric lifted the box, tension from something caused a chain of events." So Delko's responsible for blowing up the barn? Way to go, Swifty. There's some more babble about the bomb -- blah blah blah, gasoline and guitar strings, blah blah blah, but I doubt Sars wants me faithfully transcribing how to build a bomb here, since that would turn us into one of those websites neglectful parents tag as a ruinous influence during their scapegoat hunt after Junior's burned down a subdivision or gunned down his intramural volleyball team. In effect, what Horatio and Company have done is figured out how to tie the bomb to all of Chaz's bomb-making props, thus providing the evidence Don will need to put him away for something.