I Just Ruined My Son's Computer Time

I just ruined my son's computer time. I got home early from work one day and found him drinking. He was drinking alcohol. He is fifteen. That is too young. I took his laptop away from him and had a friend who knows how to rig up things right, and made it so that the only website he can visit is a place where I bought online Drug Education Classes. Then I grounded him. So, the only thing he can do in there to get ungrounded is to pass the online classes I registered him for. And I registered him for three of them. He is going to learn it is wrong. Then he is going to learn it is wrong again. Then he is going to learn it even again. There is no underage drinking in my family, and he is going to learn that I can punish him with online education.