Computers and their criminal investigation capabilities turned Dori Schulze, an Internal Revenue Service special agent, into a self-proclaimed “geek” by the early 1990s. That initial embrace of computers by her and her employer led to the largest retail tax evasion conviction at the time. She used a computer to gather evidence against Stew Leonard Sr., the founder of Stew Leonard’s Dairy in Norwalk, who was convicted of evading $6.8 million in taxes in 1993…