• DOT Drug & Alcohol Testing
    We specialize in Random DOT Drug and Alcohol Testing, for small to large companies.
  • DOT Physicals
    Stop by our office and get your physicals done. No wait line, same day appointments.
  • School Programs
    School and team drug testing programs available. Let us know how we can help create a program that is right for your.
  • Drug Free Workplace
    Establishing and maintaining a drug free workplace program is easier than you think, we can help create it for you.
  • Corporate Drug Testing Programs


Dr. Marjorie Greene D.C.

Certified Medical Examiner for DOT physicals

Serving Southern California’s Transportation and Workplace Testing.


In-Office Testing

Have a CCF? Bring it in to our office; we are an approved collection site for most labs. We also perform instant, alcohol and USCG testing for companies and the general public.


On-Site Testing

Whether it’s a post-accident or mass new hires, Green Light Testing Services will arrive at your location to perform all testing.


Drug Free Workplace

With Green Light Testing Services, your company will receive a turnkey drug and alcohol testing program designed around simplicity, accuracy, and affordability.

Facts About Drug Screening and DOT Physical Exams

The Department of Transportation requires all Commercial Drivers License (CDL) holders to receive periodic physical examinations, entitled “Department of Transportation Medical Examination,” to ensure the ability of the driver to safely operate a commercial vehicle. The US Department of Transportation sets the following guidelines:

  1. CDL holders (Drivers) must have 20/40 correctable vision in each eye. Glasses or contact lenses are permitted.
  2. Drivers cannot be a diabetic on needle-injected insulin; diabetes controlled through a diet or oral medication is permitted.
  3. A driver’s blood pressure must be under 160/100. Prescription medication to control blood pressure is permitted.
  4. Use of a Schedule 1 drug, amphetamine, narcotic or any other habit forming drug is not permitted.
  5. If a driver has a current diagnosis of cardiac insufficiency, collapse, congestive cardiac failure or any other cardiovascular disease, he/she will be required to provide the Medical Examiner with a stress test (performed within the last 12 months) along with a release from the driver’s physician stating that he/she can drive a commercial motor vehicle without restrictions.

The Department of Transportation also requires clearance for drivers that have been diagnosed with the following conditions: sleep apnea, recent back injury, recent major surgery, a current hernia, or have had recent workers’ compensation claims.

DOT Drug Screening

CDL Drivers are also required to take random drug screens to maintain their license. The required procedure tests for the following: Marijuana, Cocaine, Amphetamines, Opiates, PCP, Barbiturates, Benzodiazepine, Methadone, Propoxyphene, Alcohol (Urine Test)

Nationa Registry of Certified Medial ExaminersA new Federal Motor Carrier Safety Administration program now requires all commercial drivers whose current medical certificate expires on or after May 21, 2014, to be examined by a medical examiner certified and listed on the National Registry of Certified Medical Examiners. California based drivers of School Buses, School Activity Buses, Youth Buses, General Public Paratransit Vehicles, and Farm Labor Vehicles must also use an examiner listed on the Registry.

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