Say someone has called the police saying I am doing drugs.
Anything can happen under your hypothetical question if you don't answer the door. They could have probable cause to take additional action; they could get a warrant; they could go away. A real question with real facts is more appropriate for this forum.
The comments listed here are of a general nature and are not offered to create a formal attorney-client relationship -- that is, I am not, and I cannot give you legal advice here. I am Iowa licensed and, to become your attorney, I need to understand the particular facts and circumstances of your legal question and most likely meet you face to face.
The police can't enter your home without your consent or a search warrant. You are not obligated to open the door in response to a police knock. If they have a warrant, however, then they will likely announce their presence, assert that they have a search warrant and then make a forced entry into your home, which probably results in the door being smashed in. It's up to you to repair later at your cost. If you open the door to a knock or door bell, and the officer smells marijuana, then they may be able to enter even without a warrant. You should think twice about opening the door. If there are narcotics in your home and the police have already been called, then you would be wise to remove any contraband and relocate it somewhere other than your car. You are now on the grid.
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