GREENBELT, Md. - Federal prosecutors say a school bus driver has been charged with producing child pornography after an SD card was left at a convenience store counter. Twenty-seven-year-old Scott Smallwood of Upper Marlboro was arrested Friday. He was charged by criminal complaint. According to court documents, a customer at a convenience store in Clinton found an SD card, which is used to store data and images, on the counter. The patron took the card home, looked at the contents, and found several images of a man engaging in sexual conduct with a boy. The customer contacted Prince George's County police, who checked the convenience store's surveillance videos. They identified the boy and the man in the videos.