Hart said these issues are a reminder that there
is much to be done to eliminate safety risks due
to the presence of substance impaired operators
in our transportation systems. Eliminating
substance impaired driving, reaching zero
remains a battle that is far from over.
Eradicating impairment by drug use across all
modes of transportation is an even loftier goal.
An ongoing critical first step is improving the
standardization of data, an important effort to
improve transportation safety.
In 1992, the NTSB published a safety study,
Alcohol and Other Drug Involvement in Fatal
General Aviation Accidents, 1983 through 1988.
There were only a small number of fatal general
aviation accidents during the study period—35—in
which the NTSB cited drugs as a cause or factor.
Multiple drug use was identified in 15
(43 percent) of the 35 accidents.
Of the drugs detected in toxicological tests,
cocaine and marijuana were the most frequently
identified (12 and 9 accidents, respectively).
The study noted, however, that due to
quality control problems at the laboratory used
by the NTSB to test for drugs of abuse, few
conclusive toxicological tests for drugs were
obtained by the agency and test results from the
years of the study period were less reliable
than test results from the latter years of the
Since 1990, those issues have been