Which scenario automatically confers a reasonable expectation of privacy under the premises to be searched?

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The key idea is standing to challenge a search depends on having a reasonable expectation of privacy in the place being searched. An overnight guest has a private interest in the home they’re staying in—the room and personal belongings—so society recognizes a privacy expectation during the stay. That gives the guest standing to object to a search of that residence. A casual passerby is not inside the home and hasn’t adopted privacy rights there, so no reasonable expectation. A family member who does not live there may or may not have privacy rights depending on the circumstances, but it isn’t automatic. A police officer performing a search has no privacy interest in the private home and cannot claim standing. So, the scenario that automatically confers a reasonable expectation of privacy is the overnight guest.