So your teenage daughter isn't smart enough to make her own choices when it comes to what size soda she drinks, but she is smart enough to make decisions on terminating a pregnancy.
As an aside, will the Pharmacist or cashier ask for ID from the purchaser?
What if the girl in question is 14 years, and 50 weeks old? If the Pharmacist allows her to buy the pill, he is presumably breaking the law (as is she). If he doesn't, he's now punished the girl (in the words of the President) with a baby that could have been prevented, had it not been for her age.
Where exactly does a 15-year old get an ID, anyway? Too young to drive a car, and since school ID's don't typically say the child'sage/birthdate, how will the Pharmacist know how old she is?
What happens if a 17-year old buys the pills, and then gives them to a 13-year old? If that happened with cigarettes or beer, there are legal ramifications. Will there be similar laws for this? If not, why not?
Lots of questions, and those are just the first ones that rolled off the top of my brain. I'm sure there are additional ones that will come with more thought.