Kids get bored and try stuff its a part of life, maybe he wasnt actually peer pressured maybe he made the decision to try it? I understand though I wish they didnt have access to this sort of stuff untill they were of age and definatly not at school, so i guess maybe you could educated him on the effects of alcohol and the dangers. Make him understand the dangers of alcohol on teens. I wish I had some better advise but definatly talk to your husband and come up with a punishment together
Let us know how you go