The Board of Immigration Appeals has adopted the definition of a conviction contained in section 101(a)(48)(A) of the Immigration and Nationality for determining whether a petitioner has been convicted of an offense against a minor for the purposes of the Adam Walsh Act. Thus, a conviction that was expunged under section 1203.4 of the California Penal Code remains a conviction for the purposes of the Adam Walsh Act.
The full text of Matter of Calcano de Millan can be found here: