George Zimmerman Trial: Zimmerman was rejected by Prince William County Police

In the George Zimmerman murder trial today, the prosecution concentrated on Zimmerman’s unsuccessful attempt to become a police officer in Prince William County, Va. in 2009.

Prosecutors tried to paint Zimmerman as a “wanna-be-cop” who couldn't make the force.

Lt. Scott Kearns of the Prince William County Police testified in court today that Zimmerman applied for the force, but his application was rejected.

Police say he received a rejection letter three years ago, possibly because of his personal money issues.

Prosecutors also tried to catch Zimmerman in a lie. In interviews, Zimmerman claimed he wasn't aware of Florida's "stand your ground" law before he shot Trayvon Martin.

But U.S. Army Capt. Alexis Francisco Carter testified that he taught the subject in a class, and Zimmerman was an "A" student.

The defense noted that prosecutors did not prove Zimmerman was in class when the topic was discussed.

The neighborhood watch volunteer says he shot and killed Martin, 17, because he was beating him badly and feared for his life. Carter talked about how the law might be used in this case.

A firearms analyst said the bullet hole in Martin's hoodie indicates Zimmerman's gun "touched" his clothes.

Also, a DNA expert testified that none of Zimmerman's DNA was found underneath Martin's fingernails or on his gun.