> but a security system where I can hit an alarm button and then it'll deploy a loose carpet onto the stairs, would be just fine?
It may or may not be "just fine" in general (e.g., it might violate building codes, etc.), but if you deliberately used it in a condition where you were legally authorized to use deadly force in self defense, you probably wouldn't be liable for that particular use.
It may or may not be "just fine" in general (e.g., it might violate building codes, etc.), but if you deliberately used it in a condition where you were legally authorized to use deadly force in self defense, you probably wouldn't be liable for that particular use.