The former president of the security firm Blackwater has denied in sworn testimony that the company's contractors regularly used excessive force or that officials falsified travel documents. Gary Jackson said in a December deposition for a civil lawsuit that he believes both claims are false. Two former Blackwater employees, Brad and Melan Davis, have accused the company's workers of using extreme force and improperly billing for travel costs. Blackwater has since changed its name to Xe…Brad Davis contended in court documents that he witnessed contractors using unjustified force to "kill or seriously injure innocent Iraqi civilians." He said the workers did not stop to see if the civilians had been hurt or killed.