I can't imagine any laws in any state that you'd be foul of.
However, if you're at a homebrew club meeting and someone serves him a taste of homebrew, technically you've broken some laws. And given that so many homebrew club events include the imbibing of alcohol, I can't understand why he'd want to be a member if he can't take advantage of any of those events. Of course, he likely only wants to become a member because he actually brews and drinks.
Granted, I'm a student of the "it's only illegal if you get caught" school of law. But if you do get caught, having him as an official member of the club implicates the club in the actions in a far stronger way than if he's not a real member.