Yes and to be fair we weren't using the invisible fence model. He's smart and easily trainable with most things. He just has an irrational fear of strangers and a high drive. If someone was walking by our yard and he thought they were a threat the invisible fence wouldn't even slow him down.
It was more a comment about my dogs issues than the effectiveness of invisible fences.
RE: Invisible Fence System For Pet Containment: The Technology & How it Works (Research-based)