Can you get fingerprints off shell casings?
Simply so, can a shell casing be traced?
If you have a shell casing or recovered bullet from a crime and a suspect weapon you can test-fire and compare the marks left behind. The bullet casings can't be traced back to the gun, but the bullet can be, due to the rifling imprints left on the bullet as it travels down the barrel.
Likewise, how long do fingerprints stay on bullets? Fingerprints have been developed on porous surfaces (papers, etc.) forty years and later after their deposition. On non-porous surfaces, they can also last a very long time.
Beside this, can fingerprints be wiped off?
Barring some extraordinary science that has escaped me, yes. Wiping down almost any surface will at least smear any latent fingerprints that may be there. Wiping down almost any surface will at least smear any latent fingerprints that may be there. The prints will be difficult, at best, to recover and identify.
What do police do with shell casings?
Police often find that shell casings they collect from a crime scene are their most valuable evidence. Ballistic testing can offer clues about what kind of gun was used and, sometimes, whether that same gun was used in another crime.