julie kerry has more from arlington. >> reporter: dr. mark perland is a key witness against michael gardner, a husband of a city council woman, gardner accused of sexually molesting three of his young daughter's friends last june. one at a sleepover and two at a birthday slumber party. dna analyzed by the virginia department of forensic science. with dna taken from neunderweara match is 20.7 quadrillion. with dna from another child, a match is 3,000 times more probable than a match to an unrelated caucasian person. the prosecution's final witness was the now 10-year-old girl who says she was fondled by gardner when she slept over with his daughter the night before the party. when gardner's daughter called him in the room during a thunderstorm, he lay on the floor between where the two girls were sleeping, and repeatedly touched her stomach, chest and private parts. said the girl, he asked me if it felt good and i said no. she said she didn't tell her parents the next day because she was scared and embarrassed. but defense attorneys expos