Don't open your door at the sound or a knock or bell. Know who's at your door before opening it. Install a wide-angle peephole in your front door so you can look out without being seen yourself.
Don't rely on chain locks for security. They're only good for privacy.
Don't open the door to a delivery or service person unless you are expecting a package or a call. Ask for the person's name and the name and phone number of the company. Call it to confirm the visit. Keep the door closed and locked in the meantime.
Check photo registration card before dealing with any solicitors, peddlers, interviewers, etc. These persons are required to obtain a card from the SDPD and display it on the front of their clothing. They are allowed to solicit only between 9:00 a.m. and 8:00 p.m. except by appointment. Call their agency to verify their identity.
Call the SDPD if a solicitor does not have a registration card. Use the non-emergency numbers, 619-531-2000 or 858-484-3154. And provide the dispatcher with a good description of the person.
Post a NO SOLICITING sign if you don't want any solicitor to ring your door bell, knock on your door, or make any other sound to attract your attention.
Ask for photo identification before letting in anyone you don't know. Check out the identification with the company or agency if you are suspicious.
Never let a stranger enter your home to use the telephone. Offer to make the call yourself in an emergency.
Consider getting a dog that will bark when someone is at the door.
Call 911 if the person at the door is aggressive in knocking or ringing the doorbell, or is otherwise threatening.
If you don't want to answer the door and don't want the person there to think that no one is home, say something like "We can't come to the door now," or "We don't open the door to strangers."