"Deep inside the Central Intelligence Agency is a unit dedicated to uncovering the true physical and mental states of world leaders. The Medical and Psychological Assessment Cell, or MPAC, employs or consults physicians, sociologists, political scientists, and cultural anthropologists to examine the conditions of top officials.
Agents will collect medical waste items, which can yield important information about someone’s medical condition.
“No discarded bandage or something like a syringe should be discounted because you can draw DNA and blood types and you can do some examination on the contents of even a discarded band-aid to try to determine perhaps what’s wrong with that person. So, as unseemly as that may sound, this is what intelligence services do".
Then there are sort of apocryphal stories, which probably have some truth to it, that they have been able to surreptitiously obtain bodily fluids. And there are sort of several well-known examples of diverting plumbing in [the presidential guest residence] Blair House, or other places abroad where they are able to obtain stool and urine samples."