South Dakota investigators in 2019 began searching his email account, as well as his cellular and internet service providers, for possible possession of child pornography after his accounts were flagged by a technology firm. Sanford, a banker turned philanthropist, is the state’s richest man and has donated billions to hospitals, universities and charities. Denny Sanford following an investigation into possible possession of child pornography, saying it found no “prosecutable offenses” within the state’s jurisdiction, according to a court document filed Friday. The South Dakota attorney general’s office has declined to file charges against billionaire T.