A police technician on Thursday showed a jury a dirty gray T-shirt that was found in Rock Creek Park, where the remains of federal intern Chandra Levy were discovered in 2002.

The small T-shirt that displayed a reference to the University of Southern California was found in the park after Levy's remains were located, according to testimony Thursday afternoon. It was stained and soiled when Metropolitan Police Department technician John Allie held it up for the court.

"It was dirty," Allie said, when describing the shirt's condition when it was processed by investigators. "It was dirt encrusted."

Levy, whose disappearance in 2001 sparked a national media frenzy, was earning a master's degree from the University of Southern California. Her graduation was approaching when she went missing and her remains were found in the park about a year later.

The trial of the man accused of killing Levy, Ingmar Guandique, is underway in Washington. Witness testimony started earlier this week.

Part of Allie's testimony seemed to contradict that of Philip Palmer, the cabinetmaker who discovered Levy's remains. In testimony earlier this week, Palmer said he found police conduct at the scene "appalling" but Allie said there was "no trampling of the scene of any sort."

Allie said police used dogs and police recruits to search the area, and said authorities were at the scene for about 27 days. Photos of evidence that were displayed at the trial also showed authorities wearing at least one glove while handling items.

For more on the proceedings, go to TBD's interactive of the courtroom yesterday.