If you're staying over at my house while I'm away, the cops ask you for permission to search the place thinking it is your house, and you say yes, anything they find is admissible because they had a good faith belief they were conducting a legal search.
A while back, I left my house and accidentally left my overhead garage door open. The door that leads from my garage to my house is usually unlocked, and it was that day. When I didn't return for a couple hours, my neighbor across the street grew concerned and called the police, who came and checked my house for intruders, then closed my garage door.
All well and good in practice, as I am one of those who has nothing to hide. But I also feel strongly about my privacy. I believe that what the police did was entirely lawful, but I would prefer it not happen; knowing the crime rate in my area, I would prefer to accept the risk of criminal intrusion than the violation of privacy.
Suppose a person in such a situation posted a sign on the door from the garage to the house that said, "Notice By Owner: I do not consent to any searches of these premises for any reason." Would that change the legality of the police entering the home? If they found evidence during the search, would it be admissible? If you were going to attempt to solve the issue, how would you word the sign (or other solution)?
I understand you can't give legal advice and I am only interested to hear your unofficial opinion.