We are in a state, I think, of violent agreement. Regarding the Kennedys, I would want the same law applied to them as to Rush and to Joe Sixpack irrespective of other considerations. Obviously if it is being selectively applied, then the problem is not necessarily with the law but with the prosecutors. And yes, that does qualify as political persecution. But selective application of a law doesn't make it a bad law in and of itself.
As to the specifics of the law in Florida - and how it is (un)enforced - I am no expert. But nothing erodes trust faster than hypocrisy, so we have to make sure we don't give media enough ammo to start screaming "hypocrisy", and we know they will, given the smallest opening.
Personally, I think the prosecution will, within a few weeks, quietly drop the case. Rush is not stupid, and has a backbone, has an enormous popular following, and has the ability to hire top-drawer legal counsel. It's a no-win situation for the prosecution.
In addition, the "War on Drugs" has made it a living hell for doctors to manage pain in this country.
Whether the law is good or bad, selectively applying the law on someone because of his politics is wrong.