Final answer:
The validity of an inspection certificate after a vehicle sale varies by jurisdiction. Some areas may allow it to remain valid for 30 days, others may require immediate re-inspection.
Step-by-step explanation:
The statement that upon the transfer or casual (non-dealer) sale of a vehicle or trailer, any inspection certificate issued prior to the date of sale or transfer remains valid for 30 days can be either true or false depending on the jurisdiction in question. Vehicle inspection laws vary from one place to another, and it's essential to check local laws for the specific rules regarding the validity of inspection certificates after the sale of a vehicle.
In some jurisdictions, the inspection certificate does remain valid for 30 days post-transfer to allow the new owner time to re-register the vehicle in their name. However, this is not a universal rule, and in other areas, a new inspection may be required immediately upon transfer of ownership. For an accurate answer, one would have to refer to the motor vehicle laws pertaining to the specific state or country where the sale or transfer is taking place.