Teague is a test that governs petitions brought 28 USC 2254 or 28 USC 2255. Padilla's case was decided on an appeal from the Kentucky Supreme Court, which is not governed by these statutes. Graham v. Collins, 506 U.S. 461, 505 (1993). Therefore, Teague should not govern state review of state convictions at all. See Danforth v. Minnesota, 552 U.S. 264, 273, 128 S.Ct. 1029, 169 L.Ed.2d 859 (2008). The states, however, are free to adopt the Teague rule if they wish. Maryland, for example, has already adopted such a broader rule, which means that people in Maryland can continue to bring Padilla claims for cases that were final on March 31, 2010. Denisyuk v. State, 422 Md. 462 (2011).
RETROACTIVITY " ADMINISTRATIVE CHANGE IN THE LAW " RETROACTIVE UNLESS BURDEN ON APPLICANT
Whether an administrative (as opposed to statutory or judicial) change in the law is subject to different rules regarding retroactive application. In general an administrative change in law is retroactive unless there is a burden on the applicant. Retail, Wholesale and Department Store Union, AFL"CIO v. NLRB, 466 F.2d 380 (D.C.Cir.1972), Miguel-Miguel v. Gonzales, 500 F.3d 941, 950 (9th Cir. 2007); Montgomery Ward & Co., Inc. v. FTC, 691 F.2d 1322 (9th Cir.1982).
Thanks to Stacy Tolchin.