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Police smell drugs outside an apartment door. Without threatening to enter, they knock and announce, "Police, we would like to talk." They then hear people running, toilets flushing, and someone shout, "Destroy it." Police force entry and find drugs. Which is the best analysis?

Invalid, because police may never knock before obtaining a warrant when they smell drugs.
Invalid, because any police-created reaction eliminates exigency.
Valid only if officers first obtained consent from the landlord.
Valid if officers reasonably believed evidence was being destroyed and did not create the exigency by threatening or committing an unlawful entry.