Last year, military surveillance aircraft in Texas were outfitted with devices designed to spy on mobile phones, including their location, numbers dialled, text messages and photos, and even the content of their calls, The Texas Observer reports. The newspaper obtained documents between the Texas National Guard, the DEA, and a Maryland-based company called Digital Receiver Technology (DRT) outlining a $US373,000 ($489,208) contract to install mobile phone surveillance software on the planes as part of anti-drug trafficking operations. The money reportedly came from Texas drug asset forfeiture funds.