This by itself indicates that GZ has something to hide, though. He obviously lied to the police in part:

Volunteer George Zimmerman, 28, told police he had stepped out of his truck to check the name of the street he was on when Trayvon jumped him from behind and attacked him, police said. He said he feared for his life and fired a semiautomatic handgun he was licensed to carry, because he feared for his life…

sun-sentinel.com