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Illinois State Police forensic scientist Pauline Gordon said she tested the gun and found an inadequate measure of DNA belonging to a man who was not a match for main suspect William Balfour, The AP reports.

However, Gordon also told the court in Chicago that that a DNA sample may not be present if the killer had wiped the weapon clean, or had worn gloves.

The SUV vehicle which Jennifer's brother Jason owned and which her nephew, Julian King, was found dead in was also tested by Gordon, who explained that she took swabs from door handles, the rearview mirror, gear shift and other areas of the car.

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Gordon also tested other objects, but said that she found nothing matching the murder suspect's DNA.

Her colleague Robert Berk testified that he found gunshot residue on the ceiling above the rear seat of Jason Hudson's car, and on a steering wheel cover in Balfour's vehicle.

Berk added that the residue on the steering wheel cover correlated with someone firing a gun, before driving the car.

Balfour faces three counts of first-degree murder relating to Jennifer's mother Darnell Hudson Donerson, Jason and Julian in October 2008.

He is also accused of home invasion, aggravated kidnapping, residential burglary and possession of a stolen motor vehicle and has pleaded not guilty to all charges.

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Jennifer Hudson family murder suspect DNA not on weapon, court hears