Not that it matters what the underlying reason is, but last year CBP decided to give 6 shipping companies from China a "taste" of what to expect if they didn't take steps to stop their services from being used to ship contraband. The worst penalty, being banned from participating in the custom's programs allowing efficient entry of packages, effectively putting them out of business for the ban period, One of the 6 banned was Seko Logistics. They sued CBP, eventually all 6 were reinstated after presenting an action plan to stop contraband.
This was a big deal, and it got the message across loud and clear that " if CBP catches contraband in your cargo, we may not be able to get the guys in China sending it, so we'll hold you responsible instead. "
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This very effective tactic made it obvious to me the old way of doing things, packs coming straight from China to a customers door in the US with just about any type of contraband, was coming to an end.