Wizards and Weed

Jamie Waylett, an actor in the recent Harry Potter movie was caught growing weed.  That's pretty funny.  

If my Harry Potter lore is correct (which I'm pretty sure it is) Waylett's character, Vincent Crabbe, could easily have grown weed in Hogwarts.  He was a Slytherin crony of Draco Malfoy, and was certainly not adverse to breaking the law.  In fact, JK Rowling could have taken a page from the U.S. Government and had the Slytherins sell weed to finance some type of evil plan, like resurrecting the Dark Lord Cheney (oops, Voldemort)