CathyA, that’s the point. It can’t be removed without raising alarms. .And you can’t torture someone without it transmitting suspicious feedback. I would suspect the watch wasn’t the only device Khashoggi was carrying.
It is a possibility that US intelligence knew Khashoggi was going to be interrogated. While in the consulate, the Saudis can do whatever they want. The release of the “American Pastor” was quite coincidental to the Khashoggi mishap.