While most people think of alcohol when they hear DUI, these charges don't always involve intoxication. In some cases, a person can be charged with DUI for driving while impaired by drugs, including prescription drugs. This may come as a shock to many people who think that so long as their drugs are legally prescribed to them, they cannot face any consequences. Unfortunately, you can be charged with DUI and be up against severe penalties for getting behind the wheel of a car after taking prescription drugs.

If you have been accused of DUI involving drugs, you cannot afford to try and fight your charges alone. Experience matters in cases like these, which is why you need to contact our Fullerton DUI lawyer right away. The Law Offices of Randall T. Longwith brings dedicated and aggressive defense to every case we take on.

CONTACT us today at (714) 606-6024 to set up a free consultation! 


Though intoxication levels have a proven method for testing, measuring drug impairment is much more subjective and debatable. There is really no set standard for this, unlike blood-alcohol concentration, which is set at .08 across all 50 states.

You could be charged with DUI for driving under the influence of: 

  • Marijuana

  • Cough or sleep medication

  • Any drowsy prescription drug

  • Cocaine

  • Ecstasy

Marijuana is arguably one of the most common drugs involved in DUI cases. However, it is also the most difficult to determine accurate impairment with. Why? The psychoactive component in marijuana, also known as THC, can be detected in a person's urine or blood for around for to five weeks after they have used it. There is also no real way to conclusively tell at what time the marijuana was inhaled or consumed.

Many jurisdictions used Drug Recognition Experts (DREs) who are trained to spot drug impairment in motorists. While they do have advanced training in this area, it is not a definitive method, like BAC testing, and is therefore still very subjective.

If you have been arrested and charged with DUI due to being impaired by drugs, you need to retain legal counsel immediately. Call our firm today for your free consultation!

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