Nullification, as it should be. It isn’t generally discussed (such discussion would ruin the anti-rights, i.e. Progressive, narrative) but taking that oath not only allows an individual in law enforcement to judge the constitutionality or legality of an order or a law, it requires it.
That is its whole and only purpose. They don’t take an oath to blindly follow orders, or to obey the Dear Leader or any such nonsense as happens in more backward societies. They take an oath to uphold the constitution. That is not a trivial distinction. Those are functionally opposite concepts, so long as the constitution in question supports human rights. I’d rather they take an oath to uphold human rights (and prove that they understand the meaning of same) being as the constitution is valid only to the extent that it recognizes and protects human rights.
Know which side your sheriff serves!