Yep you make perfect sense, up until the time that someone takes their life because they have been diagnosed with cancer, quits their job to live the rest of their life, or does anything they would not have done that adversely affects the rest of their life if they did not have cancer. If you apply this 90% accuracy to screenings at airports, or the RIAA then chances are you wold outraged that your rights are being trampled on. Don't get me wrong I think that there is good in screenings, but we must educate people about possibility and probability of false positives, with knowledge comes responsibility.