The present investigation arises from the need to investigate and experiment scientifically if the contaminants established as controlled and uncontrolled variables can affect the performance of the procedure described in numeral 4.1 of the guide 2DCGU-0024 "to perform ballistic procedures to the weapons (firearms, pneumatic, gas, phisto, detonators, electric, among others) and entry to the ballistic identification systems"; it can be reasonably inferred...