3000 XP, Short Shotgun
After the Titus Andronikus quest you'll be able to talk to the prisoner Dreyfus to start this quest. To continue the quest you'll need to start The Green Mile quest to get access to the area you need to go. Once you get to the cell, you'll have to open it up at the control room. Once you're in the cell you have to find all the drugs. One on the bed is marked on your map, to the left of that you can take some metal scrap off the bed to find more drugs, there are some in the toilet, and the last are in the soap dispenser. Head back to Dreyfus after finding them to get your reward.