This principle is also highly relevant in safety critical systems for using redundant sensors. Just adding a second sensor is often not enough. Because if they disagree, which one do you trust.
One example of this is in airplanes.
One example of this is in airplanes.
Time critical scenarios are one possibility.
In a safety critical scenario intermittent sensor failure might be possible but keep in mind that consistent failure is too.
A jury scenario is presumably one of consistent failure. There's no reason to expect that an intentional liar would change his answer upon being asked again.