I don't know what perform a wedding means. I am guessing it means "organize," or mesader kiddushin. That is has no halachic consequence. Halpern is not Kasher as a witness, That is the only issue. If the other needed requirements are met, the kiddushin are valid. Halperin will go to jail for a long time.

The rules for Kosher meals are based on the case of Rabbi Meir Kahane. He had been arrested by the US and was placed on probation. He was alleged to have violated the terms of his probation, and was sentenced to serve a year and a day. When Kahane was incarcerated by the US government, the Bureau of Prisons refused him kosher food. He sued, and the case came before Judge Jack B. Weinstein, the sentencing Judge. The issue was whether kosher was an essential part of Judaism. Judge Weinstein, in his decision granting Kahane's request quoted from my late father’s Understanding Genesis (among other sources). My father had pointed out that following Jacob’s battle with the Angel, and from that day forth Jews do not eat from the sciatic nerve, and that this was the origin of the laws of Kashrut, a fundamental tenet of the Jewish faith (which was the main point being litigated). From the decision: "A theological concept central to Judaism, recognized by Jewish and non-Jewish scholars alike, is that of a "covenant" [*693] between God and man. The covenantal theme -- that God loves his people and will favor them in generations to come and lead them to a promised land, and in return men shall walk in God's way -- is repeated again and again in the [**14] Genesis stories of Noah, Abraham, Isaac, Jacob, and Joseph. See N. Sarna, Understanding Genesis 120-133 (1967). The covenant theme is the essence of stories of the exodus and of Moses, and becomes the crucible of the messages of the Prophets and essential to an understanding of the relation between God and man. See, e. g., G. von Rad, Old Testament Theology 129-135 (D. Stalker trans. 1962). Individual responsibility is not submerged in the covenant with a people. As Sarna notes: "this biblical 'doctrine of merit,' . . . has profound consequences for man, for it implies that the individual is of supreme importance and that from his actions may flow beneficial consequences for all society." N. Sarna, supra, at 151." The decision is fascinating and well worth reading. The government appealed and lost. Kosher meals were mandated top be provided by the BOP to Jewish inmates pursuant to a ruling by the Second Circuit in 1975 in 527 F.2d 492 Meir Kahane, Plaintiff-Petitioner-Appellee, v. Norman Carlson, Director of the Federal Bureau of Prisons, et al., Defendants-Respondents-Appellants (http://ftp.resource.org/courts.gov/c/F2/527/527.F2d.492.75--2088.274.html). Ever since that Appellate court ruling, the BOP has been required to provide kosher food for all Jewish inmates who request it.