NHTSA claims that when all three tests are combined the overall efficiency at identifying
BACs
above .08 is 91 percent. These numbers are very misleading, as they assume the tests
were performed correctly by the officers in ideal weather and roadside conditions
with subjects who do not have any possible medical conditions that could explain
false positives or reasons for poor performance other than intoxication.
NHTSA is relying upon a study that has not even come close to meeting the scientific
standards set forth for all other studies to be considered valid. These studies have
not been peer reviewed, the subjects were not random, the study was not a double-blind
study, etc.