Star Trek: Voyager1995

[Neelix is wary because Ensign Parsons has ordered a drink other than his usual one]

The Doctor:
Mr. Neelix, just because a man changes his drink order doesn't mean he's possessed by an alien.

Neelix:
Nevertheless, don't you think you should... scan him or dissect him or something? Just to make sure.

The Doctor:
I could examine every crew member you've mentioned so far, every person on board, for that matter, and it wouldn't do any good. From what we can tell, the alien can jump from person to person at will.

Neelix:
Sounds to me like you're defending Ensign Parsons.

The Doctor:
I'm not defending him. I'm just pointing out that you're acting a little paranoid. In fact, one could say you're acting a little... too paranoid.