Are the discharged gases from firearms currently identifiable outside of actual powder burn wounds? I am pretty sure that it is now very routine to determine if someone has fired a pistol recently just by the residue on the hands.
So, given 50-60 years, will ballistic/forensic databases have advanced to the point of logging what type of gun/round was fired in an incident solely by residual gases and powders that were present at the scene? Traces of a discharged weapon could be in the air or on the carpet... the room's ventilation filter? How routine would it be to look for this? Would caseless ammo be more easily identifiable in this method?
Do I have a clue what I am talking about? No.