Toilets overflowing with human waste and urine running down the aisle are among the deplorable conditions on buses Gov. Greg Abbott is using to ship migrants out of Texas, a whistleblower who oversaw security on the trips told ABC. A U.S Army veteran David Dillard worked for Mayhem Solutions, a contractor hired to provide security on the bus trips that are a key part of Operation Lone Star, Abbott’s $4.5 billion border crackdown, ABC reports.