Blytheville, AR - In a lawsuit filed this week, a white Blytheville police officer is accused of using excessive force against a black man on the Fourth of July, including subduing him repeatedly with a taser as he lay on the ground.Attorney James W. Harris filed the case Wednesday in Mississippi County Circuit Court on behalf of Chardrick Mitchell, who faces charges of obstruction of justice, disorderly conduct and refusal to submit to arrest.The lawsuit states that on July 4, Mitchell denied his ex-girlfriend re-entry into his apartment to retrieve what she said was clothing left inside, prompting the woman to call police.