Hi,
I don't recall when it was, though probably within the last year, someone posted that the States which originally required the fired case, to identify the bad guys or some such, had dropped the requirement. It sounded like they found, after several years and umpteen however many dollars, not a single bad guy had been caught.
I notice those guns mentioned which still have the fired case are autoloaders, which will kick cases out for the LEOs and CSIs to find. Since revolvers don't do that, maybe folks are getting just a touch smarter?
Rick C