The term “Third Party Administrator” in the drug testing business stands for an entity that coordinates several services for employers to maintain a drug testing and/or drug free workplace program. The term “Consortium” stands for a grouping of employers in the drug testing arena. The United States Department of Transportation (DOT) coined the phrase Consortium/Third Party Administrators, or C/TPA, when they rewrote the DOT drug and alcohol testing regulations (49 CFR Part 40) in 2001.

What Does C/TPA Stand For?

According the FMCSA website, “ Consortium/Third-Party Administrators (C/TPAs) manage all, or part, of an employer’s DOT drug and alcohol testing program, sometimes including maintaining required testing records. They perform tasks as agreed to by the employer to assist in implementing the drug and alcohol testing program and to help keep the employer compliant with the DOT/FMCSA Drug and Alcohol Testing rules and regulations.”

Mostly, the C/TPA manages the DOT required random testing of multiple employers and owner operators in one random testing pool. Owner operators are required by regulation to be enrolled in a C/TPA Consortium for random drug and alcohol testing.

Non-DOT employers can also engage a C/TPA for management of non-DOT random testing programs. This usually occurs within an association of employers, a union, or other grouping.

It is the expectation that a C/TPA is a professional company with advanced knowledge and expertise in drug and alcohol testing regulation and best practices. Employers hire C/TPAs to keep them safe and in regulatory compliance. Some C/TPAs are local, some regional, and some national. National Drug Screening operates as a C/TPA in all areas of the United States.

Although an employer is hiring a C/TPA to manage and administer the aspects of the drug and alcohol testing program, compliance with regulation is ultimately the employers’ responsibility. Employers can be held responsible for service agent (including C/TPA) errors and resulting civil penalty actions for noncompliance.

What is a Service Agent?

The Service agents are the various entities that are involved in providing the various drug and alcohol testing services. These entities or vendors are companies that help the employer to implement the DOT regulations. These might include:

A Consortium/Third Party Administrator (C/TPA) is also considered a service agent. The TPA coordinates a variety of drug and alcohol testing services for employers. These services can include random selections; preparation of annual Management Information System (MIS) reports; and coordinating urine collections, laboratory testing, MRO services, alcohol testing, and SAP evaluations. A C/TPA must ensure the services it provides comply with DOT regulations and that its service agents are qualified.

What Is the Difference Between TPA and C/TPA

There is not really a difference. TPA is the original name used for companies back in the 1990s, the early adopters of selling drug testing. Consortium was added by the DOT in 2001 when the DOT drug testing rules were rewritten for clarity. The term “Consortium/Third Party Administrator” came about with the 2001 version of 49 CFR Part 40. Look for a C/TPA like National Drug Screening with a status of Nationally Accredited for Administration of Drug and Alcohol Testing Programs (NAADATP). This is an accreditation from the Drug & Alcohol Testing Industry Association (DATIA) which is now merged with the National Drug & Alcohol Screening Association (NDASA).

Who are some of the Largest C/TPAs in the Nation?

There are hundreds of C/TPAs in the United States; identifying all of them would be impossible. A list of some of the more familiar names are (not all inclusive):

How Does a TPA Become Nationally Accredited?

The Drug and Alcohol Testing Industry Association (DATIA which merged with NDASA in 2023) offers a program in which a drug testing provider can become nationally accredited. This program is called Nationally Accredited for Administration of Drug and Alcohol Testing Programs (NAADATP). The goal of this program is to have a national standards program for companies that provide drug free workplace program management services, to ensure they have company specific standard operating procedures, safeguards, knowledge, and professional practices that keep their clients in compliance with federal drug and alcohol testing regulations.


The NAADATP program not only provides guidelines for management of drugfree workplace programs, it also affords employers an assurance of quality. By utilizing a NAADATP provider, employers can rest assured that the provider of services is in full compliance with regulations.

The DATIA, now merged with NDASA, website lists 37 members of its organization who have taken advantage of the accreditation program. National Drug Screening is very proud to be one of these 37. The program required comprehensive training programs and active involvement from top management of these companies. Accredited companies are required to adhere to the DATIA Standards and Code of Conduct for Drug and Alcohol Testing Program Management (DATIA merged with NDASA in 2023).

National Drug Screening (NDS) has maintained its status as nationally accredited for administration of drug and alcohol testing for more than four years. It remains important to NDS to provide services with the accreditation standards of quality, integrity, responsibility, and industry support.