Police are enforcers, yes, but for them to be ordered to invade and seize property without a warrantor writ signed by a judge puts them as well as those who ordered the invasion and seizure in a very bad position. Note that town officials, not a judge issued the order. The constitution separates branches of government just so that this kind of abuse of the system cannot, or at least should not occur.
For the police officer, this case is not much different than a soldier who is ordered to fire on civilians by his/her superiors. (yes, the scale of things is different, but the principle is the same). It was NOT a valid, legal order.
As was noted in some of the comments to the article, Due Process should have been followed, and that would include acquiring a warrant or writ signed by a judge. I have somewhat less issue with using a knowledgeable civilian for assistance in identifying roosters versus hens. Of course, from reading the article, the credentials of the particular individual in question may give Ms Rubalcaba's attorney a field day.