Bottom Line Up Front
Do not open (nor even unlock) your [exterior] door[s] until you’re confident this person does not represent a threat.
John Farnam
Excellent advice on many items in John’s post.
Also read this post about ‘Castle Defense.’
http://modernserviceweapons.com/?p=18502
Forewarned is forearmed.
Thank you tacticalprofessor. I like Mr. Farnam’s plain English conditions versus the Condition 0, Condition 1, etc. of firearm readiness.