Via following a Sitemeter referral (someone at the FBI was looking for answers and ended up on my blog) I discovered The California Criminalistics Institute did a study on obtaining forensic evidence from cartridge casings before and after firing. The conclusions were:
Likelihood of obtaining useable fingerprints on c. cases:
If you eliminate bloody prints from consideration, then only 3/32 [9%] cartridge cases displayed useable prints.
No useable prints were obtained on the cartridge cases that had been fired.
If you eliminate bloody prints from consideration, then no DNA profiles were obtained.
I’m not sure that it’s of any use to me but I found it fascinating.