Drugs in 'The OC'

There's really not that many drugs in The OC even though I picked an episode where they are mentioned.

They come mostly towards the end (31 mins) when Trey takes what is assumed to be cocaine using his key, which had been hidden down the side of the sofa. The shot is cut before you can see him taking it, it's assumed he does before he attempts to rape Marissa. There's no focus on teh drugs as it's a clean cut US teen drama.