Tested a drivers skill...
in a simulator... What exactly was tested? Reaction times? I could see how drunk driving and demanding phone calls could be correlated in reaction times. But what of decision making? Someone on a hands free set merely has to stop talking and seriously concentrate on avoiding/mitigating an accident whereas somebody under the influence of alcohol can't instantly become sober.
Don't get me wrong it's not impossible that a conversation can distract a driver as anybody who has seen the driving 'skill' of soccer mom in a mini-van can attest to, but I don't believe it's so black and white as they are making it out to be.
Besides are they going to make talking to passengers illegal too? Researcher based link bait this is.