Good ruling....the US Constitution gives the feds zero jurisdidction in such matters. This is a no-brainer for a conservative justice.
While I agree with you, the source of federal authority for the CSA, the commerce clause, was not really directly at issue in this case. It was assumed to exist.
I haven't read the opinion of the Court or the primary dissent yet, but I did give Thomas' separate dissent a quick read. You can find it
here.
He basically called everyone except Scalia a hypocrite, and claimed the whole issue was decided in
Raich. I agree.
You may want to go back and read the last few paragraphs of Thomas' statement. Indeed he was calling out the majority opinion in Raich, but he also called into question the powers exhibited by CSA and the Attorney General. Scalia and Roberts did not (and Scalia's last paragraph put too much concern on precedent instead of a constructionist reading of the Constitution), or has less of a problem with it than Thomas.