The threat of drunk drivers is being surpassed by the threat of drivers under the influence of drugs in Tennessee. There were 431 crashes last year involving drivers who tested positive for drugs in the state. A recently study by the national Governor’s Highway Safety Association reports drugs were present in 43 percent of fatal crashes with a known test result – more often than alcohol was present. Last year, troopers say, 211 people were killed in crashes involving a driver who tested positive for drugs. It is illegal in the state of Tennessee to drive under the influence of drugs. Penalties are no different than alcohol-impaired driving. Penalties are dependent on the number of offenses the driver has accrued, which become more severe as the number increases.