I have always understood from our Police types that when you shoot an intruder and he falls outside, to pick him up and throw him back inside and that yes, the Police will be able to tell what happened and what you did....

Personally, I believe that if the impact(s) throws him on the outside of the door, I will just leave him there. Yes, I believe the Police will be able to figure out that he was inside when I blew him backwards. I believe that will cause less paperwork and...stuttering on my part, trying to explain why I did something hokey.

The Police will just figure that I have saved them a bigger investigation at some unknown future date.
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QMC, USCG (Ret)
The best luck is what you make yourself!