This could also be titled, "Federal Government to States: We know best!"
The issue here is that the Federal government wants the power to prevent sick patients from smoking home-grown marijuana that a doctor recommended to relieve chronic pain.
Justice O'Connor in her dissent hits the nail right on the head:
"This case exemplifies the role of states as laboratories," O'Connor wrote.
"Relying on Congress' abstract assertions, the court has endorsed making it a federal crime to grow small amounts of marijuana in one's own home for one's own medicinal use," she said. "This overreaching stifles an express choice by some states ... to regulate medical marijuana differently."