You can setup cameras in the house in public areas like the living room without any issues. You do have to let the residents know. But guests or intruders should not expect privacy in the living room of your house, so you can secretly record in those places. You can't secretly record guests in places like bathrooms or guest rooms, since guests expect privacy in those places even when they are in your house. And you can always install external cameras without restriction since people can't expect privacy when they are outside.Someone has been accessing my house when we are gone. I need to find out who.