An 18-year-old who says he was confined to a room in a home with little food for years was so malnourished he still had his baby teeth and looked much younger than his age, a detective testified Thursday.

"I thought he was a 12-year-old boy," said Detective Kevin Morgan with the Paulding County Sheriff's Office. The teen stood five-foot-one and weighed 87 pounds when he was found in downtown Los Angeles. The teen's skin was translucent, and he told investigators he hadn't seen the sun in two years, Morgan said.