No bill of attainder or ex post facto Law shall be passed. (From Article 1 Section 9 of the US Constitution)
No state shall... pass any bill of attainder, ex post facto law... (From Article 1 Section 10 of the US Constitution)
Ex post facto: Latin for "from a thing done afterward." Ex post facto is most typically used to refer to a law that applies retroactively, thereby criminalizing conduct that was legal when originally performed. Two clauses in the US Constitution prohibit ex post facto laws: Art 1, § 9 and Art. 1 § 10. see, e.g. Collins v. Youngblood 497 US 37 (1990) and California Dep't of Corrections v. Morales 514 US 499 (1995). (http://www.law.cornell.edu/lexicon/ex_post_facto.htm)
Is there any Rule of Law at all anymore? It seems increasingly the case these days that if someone in the government wants to destroy you, then you're history, and all Constitutional protections be d@mned.
I'm not a "Rushbot" (is there such a thing?). But, I do think he's being attacked primarily because he's an influential conservative, not because his rivals really care how many pills the man's popped. There are a staggering number of celebrities that have admitted they've abused drugs, entered rehab, etc., and I don't see prosecutors rifling through their medical records.