Paulie Cantelli

 runs the chem shop in Rivet City.

He is addicted to Psycho, but his wife will not let him take any out of the inventory and he is too poor to purchase any himself, so he begs for the drug. If the player has Psycho in their inventory, they can give it to him for negative karma.

Apperances
 only appears in Fallout 3.

If you choose to give him psycho he will make his way to the supply closet and it looks like he over doses and dies next to a locked file cabinet.