CSI: Miami Season 6 Episode 11

After noise is heard in a shed at the docks, not corpses are found but a bloody mess and three pair shoes, the shocking mark of the DX-4 alias 'Vaporizer', an experimental, illegal weapon which fires up to 100,000 rounds per minute. DNA from the blood identifies three mashed-up gun runners: Hector Malcas, Eddie Padura and Pedro Rupan. There is also a cigarette with prints from Gabriel Soto. ATF sends Customs official Tanya Thorpe, who confirms there was a secret operation to trick illegal arms sale to the Middle East. However the vaporizer was being produced by Peregrine, which enjoyed special immunity to defend the top-secret project under the Patriot Act. Next its CEO Steve Lancaster is found dead, shot with a Sentry (miniature stun-gun) before a fatal air injection; he has a Navy SEAL tattoo. The only other print is from computer salesman James Reilly, another Navy veteran, who met Lancaster that day and has a virgin criminal record...