It doesn’t matter if you take them to school or pick them up. If kids want to see someone, they’re going to find a way to do it regardless of how much you stand over them. I know nothing of Levi’s drug use, but, what I do know from raising 4 kids is that the more you forbid them to see someone, the more they’ll want to see that person.
So, your argument blaming the parents if futile. Bristol knew better, but, like so many other young people, gave into the temptation.
BS. Sarah has said she knew Bristol and Levi were dating, and said (lied) that they had been planning to get married even before the pregnancy occurred. Bristol was NOT sneaking around with Levi without her parents’ knowledge. There’s no evidence that Todd and Sarah were making any effort at all to prevent or minimize Bristol’s contact with Levi.