Still, I don't think that this compares. Bad test results rarely ever cause death, especially when the really time critical tests are done in clinics. And it's

Still, I don't think that this compares. Bad test results rarely ever cause death, especially when the really time critical tests are done in clinics. And it's really hard to prove a test is wrong, or even maliciously wrong. So I do believe that someone with questionable ethics is much more likely to assume he can get away with mostly-fake lab tests than with killing patients outright with something obvious like a bad reaction to a blood transfusion. Even infections with a blood-borne Virus would probably be discovered within a year or two, because blood transfusions are sort of the first culprits you have in mind.