(Lack of Uniformity in State Drugged Driving Laws) "Overall, the State-by-State analysis indicates there is a lack of uniformity or consistency in the way the States approach drugged drivers. Having no separate offense for driving under the influence of drugs makes it difficult to distinguish between DUID and DWI-alcohol arrests and dispositions.
Statistics and data relating to operating a vehicle while under the influence of an intoxicant (DUII), also referred to as drugged driving, drunk driving, driving under the influence (DUI), or driving under the influence of drugs (DUID).
(State Laws Regarding Forced or Mandatory Testing) "Ten States have laws that either prohibit or do not address the issue of forcing a test when a driver refuses to submit to a test. Eleven States allow for a mandatory or a forceful submission to a test via a court order or search warrant. The remaining States and the District of Columbia specify circumstances under which a test becomes mandatory. For example, a test can be forced in 33 States if a driver is involved in a collision that resulted in a serious injury or a fatality.
(States Which Consider Test Refusal a Criminal Offense) "Eight States consider a test refusal as a criminal offense. The manner in which refusal is criminalized varies among the 8 States. Refusal is considered a misdemeanor in Alaska, Minnesota, Nebraska, and Ohio. It is considered an infraction in Indiana. In California, refusal becomes a criminal offense if the driver is convicted of DWI after refusal. In Vermont, refusal is criminalized for drivers with a prior DWI.
(State Sanctions for Refusing an Alcohol Test) "All but one State, Nevada, have administrative license sanctions for refusing an suspensions and revocations for varying periods of time. The suspensions and revocations include restrictions varying 3 from a 'hard' suspension period in which no driving is allowed for a specified period (in 38 States and the District of Columbia) to a 'soft' suspension period in which drivers can obtain a temporary driving permit for purposes such as work and church (available in 9 States).
(State Rules on License Suspension or Revocation for Failing Alcohol Test) "Forty-two States either administratively suspend or revoke the driver’s license of an offender who fails an alcohol test. State provisions for administrative license actions vary in terms of revocation and suspension periods, as well as whether a driving permit or a restricted license is available immediately ('soft' suspension or revocation period) or after a specified period of time ('hard' suspension or revocation period).
(Legal Standards Defining DUID) "Nationwide, three different standards have been drafted in legislation defining what constitutes OUI [Operating Under the Influence] drugs: two 'effect-based' laws and one 'per se' law.45 The first effect-based law requires that an OUI drug motorist be rendered incapable of driving due to drug use.46 The second effect-based law requires a demonstration that an OUI drug motorist’s ability to operate a motor vehicle is impaired or that the motorist is under the influence or affected by an intoxicating drug while d
"Several meta-analyses of multiple studies found that the risk of being involved in a crash significantly increased after marijuana use13 -- in a few cases, the risk doubled or more than doubled.14-16 However, a large case-control study conducted by the National Highway Traffic Safety Administration found no significant increased crash risk attributable to cannabis after controlling for drivers’ age, gender, race, and presence of alcohol.17"
"Our study suggests that, on average, MMLs are associated with reductions in traffic fatalities, particularly pronounced among those aged 25 to 44 years, a group representing a great percentage of all registered patients for medical marijuana use,29 and with increased prevalence of marijuana use after the enactment of MMLs.30 Although increases in marijuana use following the establishment of marijuana dispensaries could reduce the occurrence of alcohol-related mortality by reducing the number of drivers driving under the influence of alcohol, other simultaneous factors
Prevalence of Driving While Under the Influence of Alcohol and Other Drugs in the US
Times for THC Absorption, Bioavailability, and Excretion: "Absorption is slower following the oral route of administration with lower, more delayed peak THC levels. Bioavailability is reduced following oral ingestion due to extensive first pass metabolism. Smoking marijuana results in rapid absorption with peak THC plasma concentrations occurring prior to the end of smoking. Concentrations vary depending on the potency of marijuana and the manner in which the drug is smoked, however, peak plasma concentrations of 100-200 ng/mL are routinely encountered.