Given the verifier has physical control over the location in which the verifiee must verify themself, it's trivial to ask for info only accessible from that location at that time.
As for determining your jurisdiction, that usually means residency, which off the top of my head could be minimally verified by govt proof via (redacted) taxes filed in that state.
I am just speculating but if they don't provide door to door delivery then you probably have to upload whatever documents they need defined by law. This clears them and it doesn't matter that they are sending stuff to a mail forwarder as now you are committing a crime.
How would someone do that? How do I prove that I am right now here, to someone else that's not physically present?
On a related note, how do I, right now, while doing this activity, prove that I belong to this jurisdiction, and not others.
Important when buying weed online, for example.