The next step will be in people's homes.
Picture this...Mommy and Daddy having a Christmas party. No one is rip roaring drunk, but all would be legally drunk. Cops show up with Social Services. Kids go to foster care while Mommy and Daddy are charged with neglect.
Oh yeah, forget to say some were smoking. Drinking and smoking in the presences of minors....Mommy and Daddy may now consider themselves childless.