SANFORD, Fla. -

Florida Department of Law Enforcement analyst Amy Siewert testified in the George Zimmerman trial Wednesday.

Siewert said that residue and tearing on Trayvon Martin's hooded sweatshirt showed George Zimmerman's gun was touching Trayvon's chest when the gun was fired.

Siewert also held the 9 mm semi-automatic Kel-Tec handgun to show jurors how the gun works. Earlier in the trial, crime technician Diana Smith showed jurors the gun.

Siewert added that the gun was safe to carry around loaded, because unless the trigger was pulled it wouldn't fire.