Update: A criminal charge against a former Prince William County elementary teacher who had been accused of assaulting a 10-year-old student was dismissed at a 2012 trial, according to her attorney and court papers.

Cynthia F. Hall, 35, had been a teacher at Kerrydale Elementary School when the charge was filed in May 2012. The case was dismissed at a September 2012 trial, according to her Richmond-based lawyer, Michele Chiocca. In December, a Circuit Court judge expunged Hall’s record.

A copy of the expungement order was provided to the Washington Post.

Chiocca said a video showed that the boy had run away from class and Hall had held his arm to pull him back to the classroom. Chiocca said the boy tried to pull away from Hall, causing his injury. “From the video, the child is trying to get away. . .to run again,” Chiocca said. “The video is [why the judge] ultimately found her to be not guilty.”

Commonwealth’s Attorney Paul B. Ebert (D) said that he did not recall the case specifically, but said that such dismissals are common. “If they found reasonable doubt, that happens every day,” he said. “Certainly there was probable cause to charge, but apparently it was determined at the time of the trial whether the assault ever took place.”

Original Post: A Prince William County elementary school teacher has been arrested for assaulting a 10-year-old boy, county police say.

Police arrested Cynthia F. Hall, 35, of the 11000 Block of Golden Eagle Court in Woodbridge. Hall is a teacher at Kerrydale Elementary School, also in Woodbridge.

Police say the boy reported the assault May 17 at school where he sustained “minor injuries,” according to police.

Hall, who has been charged with assault and battery, said in her bio posted on Kerrydale’s Web site that she is in her 11th year of teaching. She also writes that she is a first-year doctoral student at George Mason University.

A school system spokesperson could not immediately be reached Wednesday.

Hall has been released on $2,000 bond and does not yet have a court date.