title: Court bars retroactive changes in licensure law. Case in point: Valdex v. Zollar 665 N.E 2d 560-IL (1996).
authors.forename: A D
authors.initials: AD
authors.lastname: Tammelleo
mesh_terms: D004521:Educational Measurement; D006801:Humans; D007087:Illinois; D008008:Licensure, Nursing / Q000331:legislation & jurisprudence*; D008910:Minnesota; D009740:Nursing Staff / Q000331:legislation & jurisprudence*; D014922:Wisconsin