It's called "implied consent", in driving on the roads of the state, you are deemed to have consented to taking the test. Every US state has such a law, generally the penalty for refusing is similar to DUI.
I came on this site looking for a copy of the motion to dismiss, and found it, thanks. My comment would be that having read it, I don't think RCL is hitting as hard as it could, being aware that these cases are also being tried in the court of public opinion through a press which has already jumped to the family's side. Thus, the lawyers, not the family is blamed. I don't believe that we've seen the clearest videos; these are good enough to demonstrate that there's no factual basis for the lawsuit. This happened next to a bar, where I'd expect to find lots of cameras. They don't want to show the graphic ones, including SA's reaction.
RCL will fight this lawsuit all the way but they aren't going to beat up on the family any worse than they have to, to win.
This post was very informative so thank you. It is certainly nice to get a lawyer’s perspective on this case.
May I ask why you are of the opinion that RC will fight this all the way as opposed to settling at some point?