[Pearls Before Swine]

The answer is yes, but the real question is, “How frequently?”

I knew an older neighbor who seemed perfectly rational at Christmas, but wandered off driving, parked his car, and died of exposure several months later. It was sad, but fortunately he didn’t take anyone with him. What frequency of testing would have anticipated a sudden decline without being oppressive?

[CGASMIA68]

He committed suicide EOM

[steve86]

If that was rapid-progression Alzheimer's (as opposed to a series of small strokes or CJD or something), it can be very rapid. This is quite uncommon.

Sadly, you just can't catch every developing bad situation in life.