Every test has a false positive rate and if you scrutinize close enough you can often guess reasons/justifications for those false positives. These rationalizat

Every test has a false positive rate and if you scrutinize close enough you can often guess reasons/justifications for those false positives. These rationalizations really aren't so important though--- the crucial bit is understanding that there will always be false positives and making a reasonable estimate for how often they'll occur.