When carrying medical or fragile cargo with passengers (e.g., lab specimens):
Correct. Some emergency medical and lab shipments are allowed under tight conditions: small quantity, proper packaging, baggage-area storage, with carrier approval.
CDL Practice Question #421
Category: Passenger
Why this question matters
This question is one of 58 in our Passenger bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.