seems like spoofing will be trivial though? When someone walks by my front door on the sidewalk, will it go off? Can my raspi emulate a human to create so man

seems like spoofing will be trivial though? When someone walks by my front door on the sidewalk, will it go off? Can my raspi emulate a human to create so many false positives that this is rendered useless? My 2 cents, this sounds great but a device / technology that likely won't overcome all of the 'what abouts' to ultimately get it shipped.