In the September/October issue of Biblical Archaeology Review, Jeffrey Tigay, Professor of Hebrew and Semitic Languages and Literature at University of Pennsylvania, confirms the Documentary Hypothesis. This was a letter to the editor in response to Yosef Reinman's letter in the May/June issue in which Reinman stated "The very idea [of the DH] is amazing. Never in the history of the world has a book been spliced together from multiple documents by the kind of elaborate surgery that the critics perform on the Bible text."
Tigay's reply, "I wonder how hard Rabbi Reinman looked before concluding that no book was ever composed this way. In fact, there are several examples, from ancient to modern times, of exactly this process. As Biblical scholars have known since the late 19th century, the second-century Syrian bishop Tatian composed the Diotessoron, a single running biography of Jesus, by splicing together the four Gospels using exactly the same techniques supposed by the Documentary Hypothesis. In the same way, in the version of the Torah used by the Samaritans, the two separate versions of Moses’ appointment of subordinate judges found in Exodus 18 and Deuteronomy 1 were spliced together in a single narrative. So were the two Mt. Sinai narratives from Exodus 20 and Deuteronomy 5. The Temple Scroll from Qumran was composed by splicing together passages from Deuteronomy and other books of the Bible plus several extrabiblical works. In modern times, the Hebrew writers Hayim Nachrnan Bialik and Yehoshua Hana Rawnitzki composed their classic anthology of Jewish legends (Sefer Ha-Aggadah) by using very similar techniques. In the 1980s I edited a volume, Empirical Models for Biblical Criticism, in which several colleagues and I presented these and other examples of such methods. The book was reprinted in 2005 by Wipf and Stock Publishers of Eugene, Oregon. There, readers will see that the methods of composition supposed by the Documentary Hypothesis are very far from being outlandish and unparalleled in the history of the world."
OK, so these examples don't really "confirm" the DH, but they are certainly more than an adequate refutation of Reinman's assertion. (Perhaps Reinman will respond in a future issue. If so, expect him to use a "moving target" rebuttal.)
By the way, Tigay was also the author of the marvelous JPS Commentary on Deuteronomy, so stay away from this if you can't handle an historical/critical approach to Torah.