You don’t have to open your door for anybody. Be warned, if the police have a warrant to search your home, they may break the door getting in. But, if the police want to “talk” to you and don’t have a warrant, they are fishing for information. Police are required to “Knock and announce.” This means the police must identify themselves as police officers. If you do open the door, the police may ask to look around inside. You can say no. you should say no.  Be warned, that police can use the information they gather standing in your doorway, like smells and items out in the open, to get the probable cause needed to make searching your home reasonable. If the police have a warrant. You don’t need to be home for the police to enter and search. You have a right to read/ be read the information used to obtain the search warrant. The warrant must be signed by a judge to be valid. Police must leave a receipt indicating the items taken from your home.  A copy of the warrant and the receipt will be left behind.