The California Horse Racing Board has filed a complaint with the board of stewards at Santa Anita Park seeking the disqualification of the horse Justify from his win in the 2018 Santa Anita Derby due to a post-race positive for scopolamine, the board said on Thursday. The complaint was a requirement of a settlement that the board reached recently with the owner-trainer Mick Ruis, who sued the CHRB after The New York Times revealed last year that the board dismissed the post-race positive due to its conclusion that the scopolamine was accidentally ingested. Ruis owned and trained the second-place finisher in the 2018 Santa Anita Derby, Bolt d’Oro. The board also said that it filed a complaint seeking the disqualification of Hoppertunity from the Tokyo City Cup at Santa Anita on April 8, 2018, based on a positive for scopolamine that was also dismissed. The Tokyo City Cup was held the day after the Santa Anita Derby, and Hoppertunity won the race by 6 1/2 lengths as the 1-5 favorite. “While not the subject of current litigation, the medication positive was similar to the one involving Justify,” the board said in a statement. Both Justify and Hoppertunity are trained by Bob Baffert. “The CHRB will not be filing a complaint against trainer Bob Baffert, due to substantial evidence that the scopolamine resulted from environmental contamination,” the board said in a release. The Santa Anita Derby had a $1 million purse. The Tokyo City Cup had a purse of $100,345. The board of stewards have scheduled a hearing into both potential disqualifications for Sept. 20 at Santa Anita, the CHRB said in its announcement. In his suit against the board, Ruis claimed that the CHRB was required to disqualify Justify under an existing rule that states that a horse must be disqualified if the horse tests positive for a Class 1, 2, or 3 drug. At the time that Justify tested positive, scopolamine was listed in California regulations as a Class 3 drug. The CHRB later classified scopolamine as a Class 4 drug, consistent with recommendations issued by a national regulatory group earlier in the year. Class 4 drug positives do not automatically trigger a purse redistribution. Scopolamine can be found in jimsonweed, a common contaminant of horse feed and bedding. The CHRB had said that an investigation had determined that Justify had ingested jimsonweed accidentally. The CHRB dismissed the case without filing a complaint, but the revelation of the dismissal a year later caused an outcry from some quarters of the industry. The CHRB said that its investigators had found physical evidence of jimsonweed on the Santa Anita backstretch and that the post-race samples from seven horses, including those of Justify and Hoppertunity, tested positive for both scolopamine and atropine, which also is found in jimsonweed. In late May this year, Santa Anita stewards issued warnings to four trainers after runners in their care tested positive for scopolamine after races held from mid-October to mid-February. In their rulings, the stewards wrote that “contamination was the cause for these positives and warnings were the appropriate penalty.”