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As has already been pointed out several times by T4C and Pterion, the bill almost definitely arose out of the DNP debate, which, with the fire behind it, caused the AMA to throw a haymaker without thinking the ramifications through. I don't think this was a swing at psychologists.
Indeed, but who cares about the intent if the end result would have affected every psychologist? You can see just how quickly this thread turned into attempts to de-legitimize psychologists. This is merely a microcosm of just how damaging and thoughtless this move was regardless of where it began.