Another Top 10 Quarter Horse Trainer Suspended Over Carmoterol Positive
Quarter Horse trainer Jeremy Derozin received a one-year suspension from the Louisiana State Racing Commission after two of his horses tested positive for carmoterol, according to published reports in TRACK Magazine and StallioneSearch.com.
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Derozin, who ranked 10th on the American Quarter Horse Association's list of leading trainer by 2024 earnings, is the fifth Top 10 trainer to be sidelined for the same drug. Toby Keeton, who set an all-time earnings record in 2024, was summarily suspended earlier this year in two states, Texas and New Mexico, after 30 of his horses allegedly were found to have carmoterol in their system. One of the horses was Hezgothelook Z, who became Quarter Horse racing's second Triple Crown winner with his victory in the 2024 All American Futurity, the sport's biggest race.
Juan Diaz Jr., second on the 2024 earnings list, was also summarily suspended in Texas for multiple carmoterol positives. Heath Taylor, third on the money list, has been summarily suspended in New Mexico for carmoterol. Monty Arrossa, who led the list in 2020 and '21 and was sixth in 2024, was notified of two positive carmoterol tests by the California Horse Racing Board. The regulator has taken no action against Arrossa to date, but according to Daily Racing Form, officials at Los Alamitos, where Arrossa was leading trainer in 2024, have banned him from training at the Southern California track while the regulatory process plays out.
According to the StallioneSearch report, samples from two of Derozin's horses were cleared by Industrial Laboratories in Colorado, but secondary samples were sent to the Maddy Laboratory at the University of California at Davis. The latter detected the carmoterol, the reports said. The samples were reported to be from a race at Delta Downs in June 2024 and Evangeline Downs in December 2024.
Derozin received consecutive six-month suspensions for each of the positive findings, the reports said.
Both horses reportedly were owned by Rogelio Marquez Jr.
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Derozin and Marquez had six horses entered to race in stakes at Delta Downs July 12. All were ordered scratched by the stewards. All of Derozin's horses have been put on the vet's list.
Carmoterol is a fast-acting and potent bronchodilator that was used in clinical trials about 15 years ago but was not approved by the FDA and never made it to market.
It was also reported that a Derozin/Marquez Jr. horse was denied entry for the $597,622 Lee Berwick Futurity July 12 after hair testing allegedly detected the prohibited drug olodaterol, another bronchodilator, used in humans to treat COPD. A second positive for the same drug was allegedly detected in a horse trained by Patrick Clemons for owner Luis Armando Castellanos.
This story was originally reported by Paulick Report on Jul 15, 2025, where it first appeared.
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