In some states, it makes a difference if your keys are in ignition or not. Which makes me wonder how they treat push-button start cars? Otherwise, what happen

In some states, it makes a difference if your keys are in ignition or not. Which makes me wonder how they treat push-button start cars? Otherwise, what happens if someone (sober) is giving a ride to a passed out friend, can't wake that friend up, and ends up leaving the car (with the drunk friend still in it)? In that case, everyone involved was being responsible (no drunk driving was involved at all, actual or potential).