What is the test for constitutional review under the substantive due process clause?

In reviewing a statute's constitutionality under the substantive due process clause, courts should apply one of two tests. If the right asserted is fundamental, the statute is subjected to strict scrutiny, under which it must be narrowly tailored to serve a compelling state interest. If the liberty interest is not fundamental, the statute is subjected only to the "unexacting" inquiry of whether the statute rationally advances some legitimate governmental purpose. Reno v. Flores, 507 U.S. at 301-306, 113 S.Ct. at 1447-1449.