In Nashville Indiana today, a man was convicted or a Dec 2004 death of a 2002 local high school graduate who was 20 at the time. The victim was a passanger in the car of the driver who had admitted to smoking marijuana just before driving. The driver crossed into the path of another vehicle, splitting his car into two pieces that landed 80 feet apart. The victim died at the scene. Toxicology tests showed marijuana in his bloodstream.

In another report, according to Billy R Martin of the acnp:

Effect of Cannibinoids on Performance
Cannabinoids affect sensory, psychomotor, and cognitive function. It is, therefore, not surprising that the ability to perform certain tasks is compromised in some individuals after smoking marijuana. There is little dispute that high doses of marijuana can disrupt performance when the task is difficult. Cannabinoid-induced impairment of flying and driving has been documented. As might be expected, the effects of marijuana on performance become more variable as the complexity of the task is simplified and the dose of marijuana is reduced. In a comprehensive review, Chait and Pierri (14) concluded that marijuana, at doses that produce moderate levels of intoxication, can affect a wide range of learned and unlearned behaviors, including simple motor tasks, and more complex psychomotor and cognitive tasks. Their evaluation of the literature indicated that marijuana adversely affected gross and simple motor function (body sway and hand tremor), psychomotor behaviors (rotary pursuit, Digit Symbol Substitution Test, reaction time, accuracy in divided attention tasks, and sustained attention). Heishman et al. (47) indicated that marijuana can impair complex human performance in arithmetic and recall tests up to 24 hours after smoking. Therefore, it is not surprising that motor impairment and diminution of cognition could easily lead to accidents and traffic fatalities, and that abuse of marijuana has been linked to accidents (.