See     HERE     a RIPA Special Bulletin on the U.S. DOT and OSHA’s “Joint Guidance Memorandum” on labeling chemical containers for Hazard Communication.   While primarily a concern for fillers, carriers, and emptiers, it nonetheless shows how Washington bureaucracies can tend to  “drift” into each others “turf”, if left unchecked.

For a copy of the DOT and OSHA guidance itself, see    HERE.