Chance are everyone involved will get only one chance to get it right from the get go. There is absolutely no excuse for police not wearing proper marked clothing and properly identifying themselves when making a raid. If they don't then they should be fully prepared to accept the consequences of their ill thought out and clearly irresponsible actions. If keeping secret an officers identify is that important then let him/her sit out the raid and let uniform officers do the heavy lifting. Using secrecy is a poor excuse for exercising good judgment and is just begging for a catastrophe to happen.
And if I were chosen as a juror to sit in judgment of my neighbor under similar circumstances in a trial or proceeding then I'll only have one real choice. I'm all for protecting officers in the line of duty but there are lines that must not be crossed in order to protect us against out of control police.
The question remains: Why doesn't the original author just write a letter or call the police and ask: "Why do police raiding a house wear masks?"