DALLAS (CBSDFW.COM) – A disturbing scene captured by a police squad car’s dashboard camera resulted in an officer losing his job. That officer’s trial began on Thursday morning. Quaitemes Williams has been charged with official oppression, and accused of beating and macing a driver during a January 2011 traffic stop.

Police said that Williams kicked the driver in the head and sprayed mace on him while he was in custody. The dashcam video of the incident was released by the Dallas Police Department three weeks after it occurred.

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It all started with a traffic stop along Abrams Road in northeast Dallas. The driver who was stopped by authorities is Rodarick Lyles. There was a struggle with the police officers and, the video shows, one officer hits Lyles with his fist and a flashlight while the suspect was handcuffed and on the ground.

Lyles was ultimately charged with resisting arrest and driving with a suspended license.

Chief David Brown said that Williams used excessive force, and he praised the other officer who reported the incident. Williams was fired by the Dallas Police Department.

Lyles sat on the witness stand for more than an hour on Thursday morning, with the jury listening intently. Prosecutors stated that Lyles did not assault Williams, but was repeatedly hit by the officer. Lyles said that the beating hurt a lot, and his arms were outstretched to try to avoid being hit some more.

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Lyles added that he had surgery on his shoulder as a result of this incident.

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