The Drug Influence Evaluation is a medical test made up by traffic policemen. DIE tests are administered by police who call themselves Drug Recognition Experts.
A DRE officer stops a driver, and suspects drugs. The DRE examines the driver, looking for supposed physical "indicators" of the presence of various drugs. The officer concludes that the driver is impaired by a drug, orders forced blood testing, and—before the results come back— predicts the presence of a drug belonging to a particular drug category.
Then, when the blood test does come back showing that drug, the officer's amazing prediction is taken as proof that the driver must have been impaired by that drug. How else could the officer have made that amazing prediction? [Here's how.]
Some drivers refuse blood testing. When these people are prosecuted, DRE officers' opinions are used, without toxicology testing, as evidence of drug impaired driving.
Drugs cause physical effects. Traffic police have convinced themselves they can puzzle cause and effect backward, from physical effects to impairing drug(s).
Traffic police believe they have proof DIEs work. First, in day to day use the DIE appears to validate itself. Drug Recognition Experts predict specific drugs, and later laboratory testing finds exactly those drugs! Amazing.
Second, police cite
"scientific studies" that claim to prove
DIEs are accurate. Later
you'll learn what peer-reviewed science says about the
validity of those studies.
Does any of this seem odd to you?
Is this story possible? No, it isn't. The traffic-police Drug Influence Evaluation story can't be true. Here at DECP.US I'm gonna splain to you why and how it isn't true.
Good people, bad science
Nothing here at DECP.US suggests police are liars or NHTSA's DIE validation contractors are cheats. Police are honest and honorable. We're talking about guys who run toward the sound of gunfire; they are better men than me. The lady police are better men than me. But they are not scientists.
fine folks at NHTSA and the IACP are good people doing
their best. But mostly they are not scientists.
DECP.US is not about these good people, it's about that bad science.