Drug is related to Prescription. 
you are likely to find Jeans in/at/on Drawer. you are likely to find Pot in/at/on Drawer. Pot is a different concept from Want. Want is related to Intend. 
Drug <--RelatedTo--> Prescription 
Jeans --AtLocation--> Drawer <--AtLocation-- Pot <--DistinctFrom--> Want <--RelatedTo--> Intend 