First time offenders of driving under the influence of cannabis will no longer have their driver's license revoked, a federal court in Leipzig ruled. Instead, driver's license authorities must first declare with a medical evaluation whether or not the cannabis user was fit to drive. Under current law, a drivers license can be revoked if the driver is unable to drive due to the consumption of alcohol, cannabis or other drugs. In regards to cannabis, the law applied drivers caught with one nanogram per millimeter of tetrahydrocannabinol (THC) — the principal psychoactive constituent of cannabis — in their bloodstream.