Staple guns, grease guns, cap guns, and water pistols. All other firearms leave SOME form of evidence when fired.
no, only the heard evidence obviously. You'd still leave gunpowder and a bullet behind. So if you are gunna kill someone sorry won't make a difference. :)
Yes
pop
Transfer of evidence. Everywhere you go you pick something up and leave something behind.
Probably, but none of it has survived.
saliva
duty,honor,country
yes any gun that shoots bullets has shells. A revolver doesn't 'dump' the shells out, they have to be removed by the shooter before it can be reloaded. It is a bit easier to keep track of the empty brass and avoid leaving evidence behind.
People shed hair and skin cells everyday, and they leave fingerprints on most things they touch. They could possibly leave behind saliva if they eat, drink, or smoke in public.
Behind the Evidence was created in 1936.
A criminal can leave behind evidence--hair, sperm, skin particles, that can link him/her to the crime.
900 A.D.