An Atlanta-area woman is suing a police officer after he used excessive force, busting down the door to her home and slamming her to the ground as her son watched in horror after she refused to give the officer a chess set that belonged to the former tenant.Khanay Yancey filed a federal lawsuit against Clayton County and the Clayton County Police Officer identified as Gregory Tillman. 'I was in total disbelief. I was just shocked once the door came crashing in and he [the officer] just grabbed me,' Yancey said as she spoke about the unprovoked attack that took place...