Ghost Hunter

 is a perk in Fallout: New Vegas' first DLC: Dead Money.

To acquire it, talk to Dog and follow the speech path starting with 'I watched you devour one of the Ghost People'. The perk will be awarded once you ask Dog if he can show you where he hits them.

Effects
Ghost People are much more likely to die outright, even without being dismembered or disintegrated.

Trivia
"Ghost Hunters" is the name of a television show.