I don't see that it could de-legitimize the current regime of using approved screening devices and approved instruments, or that it could cause a problem for the current officers' observations related to impairment that lead to the suspicion, that then leads to the approved screening device demand.
I should also say that this would be, as mentioned earlier, permissive, just as approved screening devices are permissive and approved instruments are permissive. They're simply authorized. The police are not required to use them, but they can use them.