A volunteer DJ has been charged with stealing donors’ credit card information from a Houston radio station and using it to make personal purchases. Michael Whitfield was arrested in December after police found him in possession of credit card information taken from more than 300 donors to KTSU, a jazz station licensed to Texas Southern University in Houston. He is being held on $200,000 bond. Police began their investigation in July 2012 after a KTSU donor reported unauthorized charges on their credit card, and they traced them to an IP address to Whitfield’s apartment. Investigators have confirmed 25 cases of theft so far, according to Donna Logan, an assistant district attorney for Harris County, Texas.