If memory serves me correctly,i believe this type of subject was already posted up.
Any ways,i don't see a problem with answering the door.All you have to do is look thru the peep hole in the door or if you don't have one ask who it is.If you don't see anyone or if they don't answer don't open the door.
Trouble is city wide,neighborhood wide.If you are that paranoid or think trouble is at the door every time some one shows up i don't know what will help.Heck,
some times a friend will show up with out warning because he was in the area.
I know some times my friends will.
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