Ginsburg was right:
One such matter is Perez v. Paragon Contractors, a case that arose out of a Department of Labor investigation into the use of child labor by members of the Fundamentalist Church of Jesus Christ of Latter-day Saints. (The F.L.D.S. church is an exiled offshoot of the Mormon Church.) In the case, Vernon Steed, a leader of the F.L.D.S. church, refused to answer questions by federal investigators, asserting that he made a religious vow not to discuss church matters. Applying Hobby Lobby, David Sam, a district-court judge in Utah, agreed with Steed, holding that his testimony would amount to a “substantial burden” on his religious beliefs—a standard used in Hobby Lobby—and excused him from testifying. The judge, also echoing Hobby Lobby, said that he needed only to determine that Steed’s views were “sincere” in order to uphold his claim. Judge Sam further noted that the government had failed to prove that demanding Steed’s testimony was not, in the words of the R.F.R.A., “the least restrictive means of furthering that compelling governmental interest.” That burden seems increasingly difficult for the government to meet.
Yeah, you read that right. A witness was excused from testifying about the possibly illegal practices of his church because it was against his religious beliefs to discuss internal church matters with outsiders.