CSI: NY Season 4 Episode 18

Lindsay: I think I'm gonna be sick.
Mac: Is that Natalie's dress?
Lindsay: Yep, she kept it in a plastic bag in the back of her closet. We collected semen samples. There were two donors, just like she said.
Mac: Call the DA, get a warrant for Jessie Carver's DNA.
Lindsay: We don't need to. He's already in the system. One of the donors is a guy named Frank Moore aka Wallace Carver.
Mac: He's not Jessie's father.
Lindsay: He's a convicted sex offender. He was released 4 years ago, never registered, he fell off the map.
Mac: And the other donor is Jessie Carver.
Lindsay: Except, he's not Jessie Carver.
Mac: Hank Bedford. 1999: sexual assault, 2001: sexual assault...
Lindsay: Check out the date of birth.
Mac: March 18, 1976.
Lindsay: He's 32 years old, Mac.
Mac: He was posing as a 17-year-old student to prey on highschool girls.