Although the argument often goes unchallenged in court, all drugs do not, by definition, produce impairment. Even though some US states define "being under the influence" as synonymous with the presence of any drug, some drugs do improve performance. In fact, low to moderate acute doses of cocaine and amphetamine can be expected to increase positive mood, energy, and alertness, especially in nontolerant individuals (74). It has been known since World War II that use of d-amphetamine can increase the ability to sustain attention for prolonged periods when performing monotonous tasks. For that reason, radar operators and pilots of both Allied and Japanese armies were issued supplies of amphetamine. Many of the performance tasks related to driving can be improved, at least in the laboratory, by treatment with stimulants (75). Although the results of one retrospective autopsy study suggest that methamphetamine users seem more likely to be involved in traffic accidents (76), a driving simulator study (77) of young people who had taken ecstasy (3,4-methylenedioxymethamphetamine) showed that basic vehicle control is only moderately affected but risk taking is increased. It seems likely that abrupt discontinuation of either drug in a chronic user could result in driving impairment, but that situation has never been tested (70). Large doses can result in toxic psychosis with symptoms indistinguishable from paranoid schizophrenia, a condition that is extremely unlikely to improve driving performance.
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Being addicted to drugs is a complicated matter condition that's been specified as a disorder that evidences in the obsessional thinking about and utilization of drugs. It's a matter that might continue to get worse and become disastrous and deadly if left untreated.