Prosecutors start building forensics case against sniper

Prosecutors today began building a forensics case against John Allen Muhammad, as the convicted sniper who is serving as his own attorney in his second trial attempted to demonstrate that little evidence linked him directly to the three-week Washington area sniping spree in October 2002.

Testimony in the trial in Rockville, Maryland, yesterday featured dramatic testimony from an emergency room physician who administered CPR to Perm Kaman Walker moments after the cab driver was shot on October 3, 2002.