Perhaps the analogy could have been clearer and the hypothetical more broad. I was trying to press on the difference between the shipper doing a very specific test vs some functionally similar but unknown test being done by the shipping company (the server-side test is unknown, it could be hashes, non-hash based image comparison, or manual review). I wasn’t asking about something like the sensitivity or specificity of those tests, rather, why we would be fine with one and not the other when the difference is not whether but when, where, and what test is applied.