Jury shown photos of bloody car seat.
Forensic scientists told Worcester Crown Court that blood found on two upright palm marks on the rear offside door and window of a Ford Galaxy vehicle matched that of the deceased.
They also found a plastic bag found in the side of the car had the prints "associated with the defendant".
Andrew Bayliss, 29, of Kings Norton, has denied murdering the 36-year-old in a country lane in Hopwood in July 2009.
Michael Burrows QC, prosecuting, alleged Bayliss stabbed Mr Arshad through the skull before leaving him lying in a ditch. Mr Arshad died in hospital a day after being found.
Robert Bone, a forensic scientist, told the court yesterday that his examinations had shown that a plastic bag found in the side of the car had prints "associated with the defendant".
He said another bloodstained print had also come into contact with the bag in the same place.
But he was unable to tell who this belonged to.
Last week the jury heard from the accused's former close friend Tatana Zackova who said Bayliss told her that he had attacked or assaulted somebody.
The court had also heard from witness Robin Perkins, who revealed he needed counselling after discovering Mr Arshad dying on the country lane.