Back in 1994...there was a fellow named Fred Zain that gave expert testimony on blood tests. Mr. Zain, it seems, regularly fabricated or altered evidence. He lied about his qualifications under oath.
You can read more
HERE
Science is only as good as the researcher. Sometimes, researchers are mistaken. Occasionally, they lie. Which seems to me to be a good reason to avoid placing total, unquestioning faith in such tests.
As for young men dying young...a friend of mine had a son who came back from Iraq about a year ago. The young man felt tired and took a nap. And he simply died. My friend and his wife haven't really recovered; perhaps parents never get over such things.
In addition, a couple of my cousins...both in their fifties...died rather suddenly. One of deep vein thrombosis (too much sitting at a desk without moving for too long). The other felt tired, took a nap (dangerous things, those naps), and never woke up. It seems he had an undiagnosed heart condition.
So...I guess I would be cautious about judging the young woman too harshly. Sometimes, the good die young for no good reason. And occassionally, we really don't know why.