The murder trial of former political adviser Mark Stobbe has heard some graphic forensic evidence.

An RCMP blood spatter expert says Stobbe's wife was attacked while upright, taken to a car in her garage, and then driven to a remote location while blood continued to leave her body.

Retired RCMP Inspector Bruce Maclean analysed hundreds of blood drops, and says there was blood on the undercarriage of her car that showed blood continued to flow while the car was in motion.

Maclean's testimony could be key to the prosecution of Stobbe, who worked as a senior political adviser in Saskatchewan and moved to the Winnipeg area in 2000 for a job with the Manitoba government.

The Crown alleges Stobbe attacked his wife with a hatchet in the couple's backyard, then drove her body to a parking lot 15 kilometres away and bicycled back home to report her missing.

Crown witnesses have testified Stobbe told them his wife disappeared while on a late-evening shopping trip.

The trial is slated to continue until the end of March.