Someone posted this on a board I visit, anyone recognize the episode? "I am looking for a scene in one of the Star Trek (Next Generation) episodes. The scene has members of the crew going to the Doctor's (I think - maybe another character) room to look for a strand of hair to use to replicate her DNA. She is not on the ship and something has happened to the transporter. I can't remember all the details. I teach forensic science and want to use this for my class. If you know which episode, please let me know. Thanks for any help."
I believe the episode you're looking for is TNG second season "Unnatural Selection." I hope this helps. Warmest Wishes, Whoa Nellie