privation of liberty or stigma," due process demands "more than average certainty on the part of the factfinder." E.B., 119 F.3d at 1110-11 (citing Santosky u. Kramer, 455 U.S. 745, 756- 58 (1982)). Accordingly, "registrants are entitled to have the burden of persuasion placed on the state, with the state obligate