The following quotes come from an FBI study of cop-killers and
attempted cop killers:
Predominately handguns were used in the assaults on officers and all but one were obtained illegally, usually in street transactions or in thefts. In contrast to media myth, none of the firearms in the study was obtained from gun shows.
Researcher Davis, in a presentation and discussion for the
International Assn. of Chiefs of Police, noted that none of the
attackers interviewed was "hindered by any law -- federal, state or local--that has ever been established to prevent gun ownership. They just laughed at gun laws.