Drug Mule is the first quest given to you by Harry.
To start the quest right Click Harry. He will ask you to Talk to Chef and pretend to be sick.
Go and do this and chef will be concerned and call the warden. While he does this, run around outside and sneak into Wardens room with the trapdoor. Go down the ladder, loot his glowstone drugs. Then return to Harry to complete the quest. He will give you the Escape? Quest.