fuagf -- in general across the law, and in particular in criminal law, there is a principle that given act(s) and/or failure(s) to act cannot by later enactment of statutory law be retroactively made criminal/illegal/subject to civil sanction/damages -- ex post facto ( http://www.law.cornell.edu/wex/ex_post_facto ) -- that, together with its twin, that (again, in particular criminal) law must be sufficiently clear as to what it is that is criminal/illegal/subject to civil sanction/damages, comprise what that reversal rested on -- whether or not any legislative history of the law as it existed prior to the 2007 modification that might be available would support, in terms of showing what the legislature intended would and/or wouldn't fall under the law, the reversal's narrower rather than broader reading of what fell under the law as it existed before the modification
Greensburg, KS - 5/4/07
"Eternal vigilance is the price of Liberty." from John Philpot Curran, Speech upon the Right of Election, 1790