However, on Tuesday new rules came into force which closed a loophole that allowed small packages worth $800 (£641) or less to be sent to the US without paying tax or fees.
—
The direct route of sending fentanyl from China to the US using small shipments worth less than $800 to avoid all inspections
This will have ramifications well beyond China. One of my company's German suppliers has been using this exemption to ship virtually all of its merchandise into the USA - even when the total ordered is much higher. They just break the shipments up into sub-$800 packages. I suspect this is a common practice around the world.