A "high level" of gunshot residue was found on a jacket allegedly worn by accused gunman Anthony Swan, and one particle found on his palm.

The 22-year-old is charged with shooting at Raymond "Yankee" Rawlins on Court Street at 10.31 a.m. last December 16.

Swan is alleged to have arrived outside the victim's family store, C&R Discount, dressed in a dark jacket, track pants with a white stripe and a black helmet with the visor down.

Prosecutors say he was transported to the scene on the back of a black Honda bike and fired multiple shots, particularly directed at a parked white delivery van where the victim was sitting.

Mr. Rawlins, 47, was not injured in the attack, but died in a separate incident a month ago.

Swan was spotted by Police on St. Monica's Road, Pembroke, around 15 minutes after the shooting. He was allegedly wearing clothing similar to that of the culprit, who was captured on CCTV, and riding a similar bike.

He led Police on a high-speed chase that ended when he crashed into a Police car on Parsons Road and tried to run off but got arrested.

A black jacket was found by investigators at the crash scene, on the ground between the bike and the Police car.

Yesterday, the jury heard from two expert witnesses Pennsylvania-based gunshot residue analyst Alfred (AJ) Schwoeble and Florida-based forensic analyst Janice Johnson.

Ms Johnson used adhesive stubs to swab the jacket for gunshot residue (GSR).

These were sent to Mr. Schwoeble, who tested them. He also analysed swabs taken from Swan's hands by Police after his arrest.

Mr. Schwoeble told the jury gunshot residue can sometimes result in tiny particles on hands, clothing and surfaces in the immediate vicinity of a gun being fired.

He found a total of 39 GSR particles on the swabs from the jacket.

"They're rated as a high level of total particles," he said, explaining the next level up is 50 particles or more, "which is considered very high".

He also found a single particle on a swab taken from Swan's right palm and described this as "low level".

Mr. Schwoeble told the court riding a motorcycle in the wind and rain could cause GSR particles to be lost from clothes. Police have described the weather as wet that day.

The expert also explained that if a shooter was wearing gloves, a particle could get onto a hand when removing them.

He agreed with defence lawyer Marc Daniels that just because someone has GSR on them, it does not mean they have fired a gun, as GSR can be transferred from an object or another person.

Mr. Daniels also inquired if GSR could get onto someone's hand from shaking hands with another person. Again, Mr. Schwoeble agreed.

The rest of Swan's clothes were seized by investigators, including a pair of black Nike sneakers, a pair of track pants with a light grey stripe down the side, and a shirt and vest. Three black gloves were also seized from the scene of Swan's crash and arrest.

Ms Johnson said the Police did not ask her to analyse the rest of those clothing items.