3 states below have a real statewide training and card requirement we could trace to a statute. 1 more have a real statewide baseline with county-level variation on top of it. That is 4 of 50 states published so far, not all 50 -- this page grows as each additional state gets the same individual verification, not a table filled in from a single aggregator source.
One honest limitation on every mandate-state page here: several states specifically require training from an accredited provider, and we have not yet confirmed accreditation status for our own course. Each page says so directly rather than implying our course satisfies a requirement we have not verified it does.