How can you sue a state for engaging in their 10 amendment rights?
I think drug warriors have a special program that blanks out the words 'Tenth Amendment'.
Thus your question will be read as, 'How can you sue a state for engaging in their ____?'
The same way you sue a bakery for engaging in their 1st Amendment rights - you find a liberal judge who doesn't give a rat's ass what the Constitution says.