The whole deal with Van Til is kind of tricky. While I don't remember him saying he believes in natural law, I will grant that he did for argument's sake. But at the same time, he also believed that the bible spoke authoritatively about everything (Defense of the Faith, 1955, first 5 pages or so).

Dooyeweerd and Carl Henry explicitly denied natural law, but they don't have many followers in the Reformed camp anyway.

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J. B. Atken
John Knox PCA
Layman, M.A. student at Louisiana College