John Collins draws on his long and storied career in forensic science to give a brief lesson on firearms. His comments are intended for those who want a basic understanding of firearms to help shape any constitutional or public-policy positions they with to support or promote. If you don't know much about guns but wish you knew enough to be conversant, this episode is for you.

John also discusses the recent FBI testing conducted on the firearm used by Alec Baldwin during the unintentional death of a movie cinematographer.