Bombs should, when detonated, fling a few bomb fragments all over the place. These fragments should, in turn, carry the bomb's forensic evidence (finger prints, fibers etc)
(1). Additionally, scanning the fragments with a mass spectrometer(or another device) should reveal details about the composition of the explosive compound
(2). Finally, the bomb fragments should help in determining what the bomb casing was made of
(3)
Notes
- Or, a subset of that evidence. So a random set of prints out of three on one bomb, for example.
- So a syndicate bomb would say something like "unknown explosive compound" or a standard TTV would return "Plasma" etc etc
- A TTV would give you parts of a plasma canister or an oxygen tank. A block of C4 would be a "miniature timing circuit" and so on.
I don't think that explosions being cold cases is that much of a problem, but adding some depth to a bombing investigation sounds like a lot of fun. Thoughts?