Good point. Might be worth making it a felony to refuse taxis to women in labor (and protecting them from potential lawsuits for not having been, in fact, an ambulance). As for the card, maybe something big like, "Your drinking took an ambulance away from an asthmatic child. She is now dead." I gather some people who go through mandatory classes after drunk driving and see videos of post-drunk driving car accidents actually do decide to do something about themselves. So the card-in-pocket idea may not be as far out as it sounds.