Detective Randy Stone carried a shotgun as he walked up to help serve a search warrant on the house at 11944 W. Rolling Hills Court just before Christmas. Stone, a Sedgwick County computer forensic expert and SWAT team member, helped Wichita police seize computer equipment inside the house of Steven Craig Perrine. “I was watching the basement windows, where we thought the computer was,” Stone testified at Perrine’s trial Wednesday at the federal courthouse in Wichita…