Testimony is scheduled to resume on Friday in the trial of a white University of Cincinnati police officer who fatally shot an unarmed black man last year.

Ray Tensing is accused of shooting Sam DuBose in the head during a traffic stop near campus.

Tensing claimed that he was being dragged by the vehicle driven by DuBose and that he feared for his life. But testimony by an expert witness for the prosecution on Thursday contradicted his claim.

Grant Fredericks, a video analyst for the case, said his review of Tensing’s body camera video showed he was not being dragged.

DuBose, 43, had been stopped over a missing front license plate. Graphic video shows tensing shooting DuBose in the head during a traffic stop as he apparently moves his car. Tensing’s lawyers have maintained that he was being dragged by the car, which he says to other officers in bodycam footage. But an independent report showed that the car moved because Dubose’s foot pressed on the accelerator after he was shot.

The report also said that the shooting was unnecessary and  “critical errors in judgement” on Tensing’s part caused the situation to escalate.

Prosecutors also introduced evidence Thursday that Tensing did not detect drugs or alcohol in DuBose’s car.

An attorney for the since-fired Tensing has said DuBose wanted to get away because of marijuana he had in the vehicle.