There is no law that says you have to open your door to a police officer.
If the police knock and ask to enter your home, you DON'T have to open the door unless they have a warrant signed by a judge. If you open your door the police are trained to step in very quickly and you surely don't want to invite the police into your house. Such an invitation not only gives the police officers the opportunity to look around for clues to your lifestyle, friends, reading material, etc; but also tends to prolong the conversation.
There is no law that says you have to open your door to a police officer. Don't open your door with the chain-lock on either, the police may shove their way in. Simply shout to the police officers "I HAVE NOTHING TO SAY."
Guest and roommates staying in your home need to be aware of their rights and told not to open the door to a police officer or invite them into your home without your permission. Never open the door to a police officer!
Never agree to go to the police station for questioning. Simply say, "I HAVE NOTHING TO SAY"
* In some emergency situations (like when a person is screaming for help from inside your home, police are chasing someone into your home, police see a felony being committed or if someone has called 911 from inside your house) police officers are allowed to enter and search your home without a warrant.
For more information about your "Rights" click the link below: http://www.policecrimes.com/police.html