Testimony in Anthony trial focuses on trash bag

Casey Anthony, right, talks with her attorney Cheney Mason during a break in her murder trial at the Orange County Courthouse, Monday, June 6, 2011, in Orlando, Fla. (AP Photo/Joe Burbank, Pool)

June 7, 2011 12:33:01 PM PDT
An attorney for a mother charged with killing her 2-year-old daughter suggested Tuesday that a crime scene investigator altered crucial evidence