When a computer, cell phone, e-mail or other high-tech device holds the key to a crime, cyber sleuths are called to dissect the digital evidence. In south Alabama, it’s Gus Dimitrelos, who is based in a Spanish Fort police office at a sprawling new retail district off Interstate 10. Besides a Secret Service lab in Birmingham for prosecutors’ use, two more regional computer forensic evidence labs will open in Montgomery and Huntsville – an expanding project, with federal funds, to move the state’s investigative operations into the cyber age…