Sex Offender Registry Not Retroactive, Kentucky High Court Rules, May 19, 2011: 

In a 5-2 decision, the high court found that anyone convicted of a sex offense before 1994 cannot be forced to give their address to law enforcement officials.
“As he was not required to register, he cannot be guilty of the crime of failing to register, and any sentence imposed on him would be manifestly infirm,” Justice Wil Schroeder wrote for the majority.

http://www.courier-journal.com/article/20110519/NEWS01/305190061/Sex-offender-registry-not-retroactive-Kentucky-high-court-rules?odyssey=nav%7Chead