Police forensic experts were grilled about their examination of Tim Bosma's truck Tuesday as the trial entered its third week.

The trial of two men accused of killing Tim Bosma has resumed Tuesday with further evidence being presented from the forensic examination of his truck. But defence lawyers for both of the accused had questions about the lack of notes, about no video being taken and how well the truck was actually secured when it was in "secure' police garages.

Testimony began with the same Halton Regional Police officer who was in the witness box at the end of last week. She was part of the team that first found blood on Bosma's truck.

The trial start was delayed about 20 minutes because of a snow storm that affected travel times for lawyers coming from out of town.

It's the third week of the Ontario Superior Court trial in Hamilton of two men charged with killing Bosma, 32, whose burned remains were found days after he disappeared after taking his truck out for a test drive with potential buyers on May 6, 2013.

Dellen Millard, 30, and Mark Smich, 28, are both facing first-degree murder charges.

Halton Regional Police Det. Const. Laura McLellan, who was among the officers who did the preliminary identification work on the truck, testified Thursday, the last day of evidence, that 64 swabs of blood from the truck and trailer in which it was found were sent to the Centre of Forensic Sciences for further examination.

Also on Thursday, the locations of cell phones belonging to Millard, Smich and their girlfriends during crucial times in the investigation were explained in painstaking detail.

Continuing from where he left off on Wednesday afternoon, Phillip Wilkinson, who works as an intelligence analyst with Ontario Provincial Police, created an extensive presentation that mapped the cell phones registered to Millard, Smich,  "Lucas Bate" (believed to be a bogus name), Smich's girlfriend Marlena Meneses, Millard's girlfriend Christina Noudga, and Bosma.

According to the presentation, Millard's phone and the Bate phone were pinging off cell towers close to each other at similar times on the night Bosma disappeared.

Follow CBC's Adam Carter's live coverage Tuesday. Court begins at 10:00 a.m. ET.

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