In order to have standing to file a lawsuit in any court, a person must demonstrate that he or she has been directly harmed by the defendant in the case. If there is a car accident and someone is injured, for example, then that person has the legal standing to file lawsuits against anyone who may have had a contributing role in the accident -- the other driver, the owner of the road, the engineer who designed the road, etc. The bystander walking by who witnessed the accident, on the other hand, has suffered no harm and therefore has no standing to file a lawsuit.
With that in mind, I'll ask the question again: Who can demonstrate harm from an OSHA mandate like this and therefore has the standing to file a lawsuit in a U.S. court of law?
“With that in mind, I’ll ask the question again:”
Your question has been answered. But keep asking if that floats your boat.