Is there ever an exception to the "Forbidden" prohibition in 49 CFR 172.101?

49 CFR 172.101(d)(1); AAMVA CDL Manual, Section 9.3.3 (nhcdm.pdf p. 9-5)

Understanding the narrow dilution/stabilization exception (not quantity, not driver qualification, not packaging) prevents a dangerous misunderstanding where someone assumes any sufficiently careful handling makes a forbidden material shippable — it doesn't, unless the material itself is reclassified under Part 173.