I like this kind of experiment, but it would have to be tightly controlled to avoid anyone viewing the object and possibly communicating it to the patient. Mayb

I like this kind of experiment, but it would have to be tightly controlled to avoid anyone viewing the object and possibly communicating it to the patient. Maybe some kind of duplicated 2FA device that shows a time-changing code and the twin device records its output over time - that would be tricky to cheat.