Purchase the highest level security that your budget will allow.
High level security is recommended by the Police Department and Insurance Companies.
Use the best quality locks to secure gates leading to your fire escape.
Turn off the telephone ringer when you are away from home for an extended period. An unanswered telephone signals to intruders that no one is home.
Install a 180-degree peephole so that you can inspect your hallway without opening your door.
Ask to see the identity of someone claiming to be from the utility or telephone company. A genuine worker will be pleased that you asked and will give you their card. Inspect the card carefully before allowing them to enter your home.
Re-key your locks immediately if you lose your key.
Ask your locksmith for a valid license, he must carry one.
When in doubt, ask for advice from your locksmith or from the Crime Prevention Officer at your local precinct.

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Leave a spare key outside your home. Most hiding places are obvious to intruders.
Leave your keys in or near the lock where it might easily be seen and taken by a thief.
Mark your keys with your identification or address.
If you have a telephone answering machine, do not leave a message revealing that you are away from home.
Never leave notes on your door, even when you're at home.
Tune the stereo or TV to your favorite station when you leave the house to indicate to an intruder that someone is at home.
If you leave a spare key outside, be creative.
Burglars routinely check under flowerpots and welcome mats and on window ledges.
Install a security system.