Blood was found on a cell phone belonging to Darronte Dill, the teenager accused of murdering two St. David's men.

Government analyst Desiree Spriggs told Dill's trial that the blood was in the mouthpiece of his Motorola phone.

The jury in the trial previously heard that the phone was seized by detectives investigating the deaths of Maxwell Brangman, 57, and Frederick Gilbert, 53. The pair was killed as they slept the night in a shed in St. David's on September 21, 2008.

Both were stabbed multiple times before Mr. Brangman's body was set on fire and Mr. Gilbert escaped into the sea and died. Dill, 19, denies murder.

Yesterday, Dr. Spriggs told the jury how she dismantled the phone during the murder investigation. She explained: "The outer areas of the cell phone were tested and were negative so it was dismantled for further testing. And, it was indicated within the mouthpiece of the cell phone that there was a positive presumptive for blood."

She explained that a "positive presumptive" test means the item should be sent away to a DNA expert for further examination, which was done in this case.

In answer to a question from prosecutor Carrington Mahoney, she confirmed that she also tested blood samples taken from victim Mr. Brangman during an autopsy.

However, she stressed that those tests were done on a different day in a different room and "there's no cross-contamination issues" with regards to the autopsy blood coming into contact with the phone.

In answer to further questions from defence lawyer Rick Woolridge she said of the blood on the phone: "It's trace evidence. Trace evidence is something that you can't see, but it's still there."

The case continues.