>>In a criminal trial, sure. As a candidate for a lifetime position on the highest court in the land, he should be above suspicion.

I once came across somebody who hanged themselves in a tree in the park. Long story. Years later, my daughters also remember finding him. They're not lying, but they weren't there either. There's a good reason why criminal codes developed the way they did; human memory is not perfect and people don't need to be deliberately lying to malign an otherwise good person by remembering something that didn't happen decades ago. This is independent of any particular witness, just a statement of principle.