Truesdail Laboratories tested and analyzed the first liquid diet-control method


In 1938, Dr. Truesdail became the official chemist for the California Horse Racing Board, i.e., we were the first lab to test racehorses in California. This developed into a formidable animal drug-testing business through the present, except for 1940-1944 when there was no horseracing during to World War II.  Truesdail has provided equine drug testing services longer than any other lab in the U.S.


Truesdail led the fight against Los Angeles smog back in 1946, with Dr. Truesdail volunteering as the chief scientist of the Los Angeles Citizen’s Smog Committee.


In 1947, we did the first air analysis survey of the Los Angeles Basin. This was long before any serious scientifically based regulations or strong enforcement, but the need to track onerous sources of air pollution became apparent. During the 1950’s, ‘60’s, and ‘70’s, we were among the top air pollution testing labs.


In 1950, Dr. Truesdail aided the American Public Health Association on food and nutritional issues.

In the early 1950’s, we were one of the initial 10 labs certified by the State of California to test drinking and wastewater.

Also, in the in the 1950’s, Dr. Truesdail became aware of seawater intrusion into coastal cities’ drinking water supplies and Colorado River canals. So, with Dr. Jeffrey from Cal Tech, he began lobbying city governments to start an extensive municipal water testing program to track and fight the contamination of our aquifers.


In 1958, we designed a lab specially or food processors and fisheries in the Long Beach – Los Angeles Harbor area.


The American Council of Independent Laboratories, in 1959, named an award for outstanding service after Dr. Roger Truesdail.


In 1960 one of our employees was a founding member of AORC, the Association of Official Racing Chemists.


A hearing and speech facility at the University of Redlands was named “Truesdail Speech Center” after Dr. Truesdail, our founder, in 1966.


In 1972, when Dr. Phil Charley, the son-in-law of Dr. Truesdail, became the president of he expanded our expertise to include product liability litigation, forensic science, and the physical testing of products. This was a formidable part of our business through 1997.

early 1980’s

Truesdail discovered MTBE (methyl tert-butyl ether) in drinking water in the Los Angeles Basin in the early 1980’s. MTBE is a fuel component for gasoline engines used as an anti-locking agent. Subsequently, much litigation regarding its use has followed.


Truesdail tested horses for the equine events in the 1984 Olympics.

Also, in 1984, we expanded our racing animal testing beyond California. In the years that followed we tested for 18 other states and several foreign countries.

late 1980’s

In the late 1980’s, Truesdail tested the dogs in the Iditarod, an annual dogsled race from Fairbanks to Nome, AK.


Truesdail expanded in 1997 its testing and licensing to include product certification. This was an offshoot of work we were doing for one of our clients. It is now a major part of our business.

1990 through 1998

Truesdail expanded in 1997 its testing and licensing to include product certification. This was an offshoot of work we were doing for one of our clients. It is now a major part of our business.


Truesdail tested the winning racehorses for many of the Kentucky Derbies from 1990 through 1998.


We tested for Chromium VI as an outcrop of the class action lawsuit against a major utility made famous by the movie Erin Brockovich, released in 2000.


In 2008 we brought our first UHPLC High Resolution LC/MS online.


In 2011, we added testing for pharmaceutical compounds in nutritional products for athletes. We are doing this as a cooperative business venture with the Catlin Consortium, noted for the initial detection and identification of the first designer anabolic steroid in athletes, later called the “Balco Scandal”. (See Nutraceuticals.)


In 2013, Truesdail was the first U.S. lab to identify the abuse of cobalt in racehorses. Subsequently, we were the first U.S. lab to earn ISO 17025 accreditation for testing.


We tested racehorses participating in the Preakness for several years, including 2015.

Certifications & Acreditations