I'd suggest reading Wickard v. Fillburn (sp?), an old Supreme Ct. case re the 10th Amendment and then you'll realize, except for a VERY few cases, the 10th Amendment has no force whatsoever; it has been regularly rejected by the Supreme Court, and was specifically shot down in the Reich case in CA. All the Feds have to do is use the magical words "interstate commerce," and it's all over but the crying.
Unfortunately, this appears to be more than a rumor (Fed. policy regarding firearms and mmj patients): Gun, medical pot groups blast ATF policy
Freaking ridiculous!

Scared