I never thought of it as something that happened at dinner. If there are only two of you, and only one of you is having just a couple of drinks, then how are they to know the other person is a DD as opposed to simply not having a drink? In that scenario, I think it's more a factor of a restaurant choosing to not charge for a soda regardless of why someone is choosing it instead of a cocktail. It'd be different if one of you was getting drunk, but most places and people don't consider a drink or two with dinner something that would require a DD. Even the guy doing my alcohol assessment after I got my DWI said he sometimes has a drink with dinner and then drives.
Many bars have a DD program, where the person who is the DD has a wristband, and drinks sodas free all night. I've never heard of that at a restaurant, though.
post edited by felix4067 - 2014/01/26 16:52:21