Troy wants desperately to help his sister win her custody case against her ex-husband Lawrence and is prepared to "do anything" including lie. As a result, Troy tells the police that he saw Lawrence strike one of the children with closed fist causing bruising to the child's face. Lawrence is arrested and charged with assault. The criminal defense lawyer retained by Lawrence proves that Troy was lying at the time he made the report to the police. What if anything can Lawrence do to recover civil damages against Troy after the criminal charges are dismissed?