- Advanced Workplace Strategies (AWSI)
 - Offering substance abuse programme management services for industry. - Ambassador Medical Services, Inc.
- Offers on site and in house drug and alcohol testing and compliance programmes.
- CannAmm
- Drug and alcohol testing for the workplace.
- Clinical Education Research Associates, Inc
- Pre-employment substance abuse screening and detection using behavorial testing.
- Compliance Plus
- Drug and alcohol testing for the workplace.
- Concorde, Inc.
- Provides management and consulting services for drug and alcohol testing.
 CPL International Services Limited
- Provides drug and alcohol screening, medical examinations, and laboratory analysis services.- Dennis M. Giroux and Associates Inc.
- Provides drug testing programme management and collection services in Southern California.
- East Coast Mobile Medical Inc.
- Mobile medical services company supplying substance abuse testing, pre-employment and periodic medical examinations, urine and breath specimen collections, etc.
- Employment Background Investigations (EBI)
- Offering worldwide employment screening, including background checks, drug testing, criminal and driving records, and credit reports.
- Expomed
- Helps implement successful onsite drug testing.
- FirstLab
- Administrator of drug and alcohol testing programmes for business and sport organisations.
- Global Drug Testing Services
- GDTS offers drug and alcohol testing and management programmes.
- Gregory and Howe
- Providing companies with drug screening programmes and services.
- Houston Medical Testing Services, Inc.
- Specialising in drug and alcohol testing, as well as DNA paternity tests.
- IEBT
- Conducts drug and alcohol testing at company facilities and locations using DOT approved procedures and laboratories. Offers training seminars.
- International Drug Testing Systems (IDTS)
- Administrator and provider of substance abuse programmes including drug and alcohol testing for industry and business.
- Land Sea and Air Medical Review
- Alcohol and urine drug testing programmes for DOT.
- MedReview, Incorporated
- National provider of DOT and non-DOT drug testing services.
- Nationwide Testing Association, Inc.
- Turnkey full DOT-compliant drug & alcohol testing programme and a transcript of the Omnibus Transportation Employee Testing Act of 1991.
- North State Alliance
- Provides full-service consortium and workplace drug testing for DOT and non-regulated companies plus substance abuse professionals, counselling, collector training, and reasonable suspicion education services.
- Norton Medical Industries
- Federally approved drug and alcohol testing programmes and education materials for DOT, FAA and Pipeline.
- OccuScreen
- Provides drug testing and background screening programmes to employers.
- OHS Health and Safety Services, Inc.
- Offers on-site drug testing services for companies and schools, testing devices, and technician training and certification.
- Oschmann Organization, The
- Provides drug and alcohol testing management and Department of Transportation compliance programmes.
- Penn Services Group
- Provides drug testing, collections, and compliance consulting to employers and agencies nationwide.
- Preferred Alliance
- We manage comprehensive D.O.T. drug & alcohol compliance systems.
- Random Drug Screens, Inc.
- Full service drug testing company that specialises in testing, educating and implementing drug-free workplace programmes.
- S & G Associates, Inc.
- Full-service provider of drug and alcohol testing programmes both DOT regulated and drug-free workplace.
- Saliva Drug Test Center
- Provides an alternative to urine drug testing.
- San Diego Reference Laboratory
- Services include drug screens and hair analysis.
- STA United, Inc.
- Specialising in DOT mandated drug and alcohol for the transportation industry.
- STAT America
- Provides employee drug testing programmes, and onsite drug screening and alcohol testing products.
- Substance Abuse Management, Inc.
- Offers workplace substance abuse testing programmes including random selection, medical review, education, and training.
- SureHire
- Provides drug, alcohol, and other occupational testing services across Canada and the United States. Private testing is also available.
- University Services MRO
- Medical review officers, drug testing services, substance abuse management, and sleep disorder centres.
- Wolfe Data
- Offers nationwide employee drug and alcohol testing services.
- WPCI Work Place Drug Testing
- Offers drug and alcohol testing programmes to employers in the U.S. and Canada.
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