It is explained in the footnotes of the ruling. The majority opinion (5-3 in this case, as no acb) is that state laws must be followed. Where state courts have overturned/created new state law, as in this case, the US Supreme Court has overturned the decisions and essentially upheld state law. In states where such nonsense is allowed, scotus has affirmed it.
Don Jr. There is so much unironic salt in the comments with idiots wailing about don Jr’s supposed coke problem with very little hunter talk.
https://mobile.twitter.com/DonaldJTrumpJr/status/1320907706685968385