A trooper who pulled over and later arrested a woman found dead in her jail cell was put on desk duty Friday for violating procedures, the Texas Department of Public Safety said. Sandra Bland, 28, was arrested July 10, and after spending the weekend in the Waller County jail, she was found hanged in her cell Monday. Harris County's medical examiner said the death was a suicide, but Bland's family disputes the finding. The FBI has joined the Texas Rangers in investigating the circumstances surrounding her death. The state Public Safety Department and Waller County district attorney have requested that the FBI conduct a forensic analysis on video footage from the incident. In arresting Bland, the trooper violated the department's procedures regarding traffic stops and the department's courtesy policy," state public safety officials said Friday without specifying what procedures the trooper, whose name has not been released, had violated. Since Bland's death, alleged video of her arrest has been posted to both Facebook and YouTube. The video shows deputies cuffing Bland on the ground. She appears to be yelling, saying the deputies slammed her head into the ground. One of the deputies then turns his attention to the person recording the altercation, telling the person to leave.