SANFORD, Fla. -

WPLG-Local 10 Brian Ely talks to Michael Knox, a forensic science and criminology consultant, about Dr. Vincent J. M. Di Maio's testimony in the George Zimmerman trial Tuesday.

Knox is a former police detective from Jacksonville, Fla. He is a recognized expert in firearms, ballistics, crime scene reconstruction, death investigations, bloodstain pattern analysis, and traffic accident reconstruction.