We had something going on around my neck of the woods where what looked like kids soliciting for <insert B.S. cause here> were scouting houses to see who is home or not during the day. Last month the outer rim of the neighbor hood had a day time robbery. No one was hurt, it was like scouted it to make sure no one was home and then hit it.
I don't know... I make it a point to address someone at the door (through the door) and let them know I'm not interested. My wife does the same, but that dead bolt don't come off until we know who's on the other side of the door.
That's what peep holes are for. If I don't know or can't see the person ringing the door bell, I don't answer. I don't care whether they know I'm at home or not.
The suburb I live in requires a permit to sell door-door, and even for those providing services, E.G. tree trimmers.
I just crack open the door and ask to see their "permit to sell door-door".
they usually say "is one required?" "yes"
If they give me crap about it, I reach for the portable phone and say " an officer is on the way to explain it to you"
They are out of here, right now.
Note, I have a firearm in the desk behind the door, within reach
In my old neighborhood, we would get that exact scenario from time to time...selling vacuum cleaners and getting paid by the demo...it was legit...heck, my wife purchased a vacuum...
I do typically shy away from letting people I don't know into my house.
I've gotten "salespeople" like that before. Even had a "No Soliciters" sign, but they would just ignore it.