At Starbucks, Baristas (Now) Told No More Than Two Drinks
online.wsj.com
online.wsj.com
There doesn't seem to be a lot of consistency with process between Starbucks stores, so I don't think this will last. Stores will just ignore the directive.
Although a huge chain, Starbucks doesn't seem to enforce standards very well. For instance, some stores are very clean and efficient, while others have obnoxious teens behind the counter making rude noises while filth piles up in the customer areas without being cleaned for hours.