1. When & where you're allowed to sell: some states have certain hours for alcohol sales, sales cannot be done at pharmacy, Starbucks, Target Cafe, Tech or any registers other than front end. Returns have to be handled a specific way. Most states mandate a minimum age to sell (ie: 18-21 depending on your state). Penalties for NOT checking ID include: TM terminated, store fined, everyone undergoes retraining.
2. Depends on the TM.
3. Yep. I've known several who had to take it several times.