The US' national law enforcement has been using drones to help nab crooks for almost nine years, but it's still making plenty of rookie mistakes. The Department of Justice's Inspector General has published an audit that shows its agencies not only making poor uses of drones, but wasting a ton of money in the process. Units in the Bureau of Alcohol, Tobacco, Firearms and Explosives spent $600,000 on drones that didn't live up to their promised abilities or couldn't even fly in the first place; in one case, a unit blew $15,000 without telling headquarters. Meanwhile, only half of the FBI's 34 drones (which cost a total of $3 million) worked as of 2014, and the agency has just two pilots that have to fly across the country to deploy their unmanned machines. It's no wonder that investigators have used drones a mere 13 times since 2006, then -- it's rarely practical to even consider the idea.