The drug war is working; there's been "a 50% reduction in 'drug use' since 1979"
The statement above is often used to encourage the public to continue the drug war. It is a monument to the duplicity of official pronouncements about the drug war.
* The statement implies that the decline in "drug use" is a significant measure. It isn't. Addiction, the real problem, increased over the same period. 
* The statement implies that the drug war produced the change. It didn't.
 Prohibition makes already dangerous drugs much more dangerous.
* The figure is presented as "fact" even though the speakers should know full well that it is a highly questionable estimate.
 Prohibition multiplies the harm done to the public by drug abuse and to the abusers themselves.