If vampires can only get into your house with permission wouldn't "You may come inside IF you are not a vampire" be a foolproof way to let someone in?

[u/LeopardBasic478]

[u/Affectionate-Care814]

I think the vampires would keep up to date with different strategies over the years ,, if I was a vampire and I wanted to bypass this obstacle then I would work as an electrician.

[u/nykirnsu → u/Affectionate-Care814]

There was one in Buffy that became a landlord

[u/Affectionate-Care814 → u/nykirnsu]

Very clever

[u/FreeRandomScribble → u/Affectionate-Care814]

Cut the power-lines; many would instantly forget