Person of Interest2011

John Reese:
The National Storm Chasers Association, Harold?

Harold Finch:
Well, it worked, didn't it?

John Reese:
We were wrong. This isn't a group conspiracy. Those numbers, they're all dead. And we're tracking their killer.

Harold Finch:
I know. I had the displeasure of seeing all that was left of the real Jack Rollins, molars and all. Some twisted mind's idea of a trophy. What if the machine sent us all six numbers to tell us that someone had been all of those people? What if a smart killer was interested not only in taking lives, but in taking identities. Like a chameleon. Changing into his victims, living their lives until he gets bored and moves on to the next. To identify such a killer, we would want to consider who he has been, and what he might look like.

John Reese:
Okay, so how do you spot someone who's that good at being anyone else?