They all think they're not leaving any evidence. As it were. Today, in warmer days, technology makes it possible to identify people NOT ONLY using ultraviolet light. If you think that you are the smartest and want to cover your tracks, just in time for the arrival of experts, they will calmly find them, for example, using a thermometer.
This cannot be done in the game, there are conventions in the game, the owner is written on the weapon, but for a change we present you with evidence, although they are all the same and I have no idea who in the database can be found using this fingerprint.