I guess in this case I'd kind of agree? I fully believe police officers should know the law and act within it. But it's certainly not their job to judge if a law might be unconstitutional. That's what courts are for. And if a lower judge thinks a law might be unconstitutional, they also cannot just repeal it but instead send it to a higher court. So if someone is in breach of a law, police should act.

The case discussed in the article is very different as police officers just believed they acted within the law. That should certainly not be enough.