MacGyver

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Answer: Late one night, Geoffrey used a covert listening device to overhear David explaining his barricade device to Janet which is how he figured it out.

How do we know Geoffrey really did use a covert listening device? They didn't mention him using one.

There was a scene of him using it when David told Janet about his barricade.

Answer: There was a scene of him going to his room and as soon as David and Janet went into David's room, Geoffrey took the listening device out of hiding and pointed it at David's door enabling him to hear everything.

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