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If your house is protected by a deadbolt, you need to see this video. Basically, there is a a technique where unskilled people can use a filed down key to open most deadbolts in seconds. A quick google of bump key offers a lot of sites where you can get them cheap, making them accessible to many.
http://www.youtube.com/watch?v=hr23tpWX8lM&NR=1
http://www.youtube.com/watch?v=hr23tpWX8lM&NR=1