This opinion by the Minnesota Board of Judicial Standards discusses how judges can sign U visa certifications consistent with the codes of judicial ethics. There are two Judicial Training and Education Updates one national https://niwaplibrary.wcl.american.edu/pubs/national-uvisa-judicial-training-update/ and one for Minnesota https://niwaplibrary.wcl.american.edu/pubs/minnesota-uvisa-judicial-training-update/ that discusses the this opinion and its implications on U visa certification by judges. The November 30, 2015 U and T Visa Law Enforcement Resource Guidefor Federal, State, Local, Tribal and Territorial Law Enforcement, Prosecutors, Judges, and Other Government Agencies written by the Department of Homeland Security provides further information for judges on U visa certification. https://niwaplibrary.wcl.american.edu/pubs/dhs-updated-u-certification-resource-guide-2015/