¶1 William Cooper, Texas prisoner # 1180768, appeals the district court’s summary judgment in favor of Sheriff Tommy Thomas of Harris County, dismissing Cooper’s 42 U.S.C. § 1983 complaint. Cooper argues that, contrary to the district court’s determination, he was exposed to asbestos in the county jail.
¶2 Because Cooper sued only Sheriff Thomas and did not allege that Sheriff Thomas was personally involved in his claims, Cooper was required to show that Sheriff Thomas “implement[ed] a policy so deficient that the policy itself is a repudiation of constitutional rights and is the moving force of the constitutional violation.” Thompkins v. Belt, 828 F.2d 298, 304 (5th Cir.1987). As the district court determined, Cooper failed to show that any policy implemented by the jail resulted in his exposure to asbestos in violation of the Fourteenth or Eighth Amendments. Although Cooper asserts that he was enrolled in an upholstery-repair class during his incarceration at the jail and that the class was conducted in the basement where high levels of asbestos were found, he did not make this factual assertion in the district court. He, thus, fails to demonstrate plain error. See Robertson v. Plano City of Texas, 70 F.3d 21, 23 (5th Cir.1995). Cooper’s request for a medical examination and chest x-ray became moot upon his transfer to the state penitentiary. See Herman v. Holiday, 238 F.3d 660, 665 (5th Cir.2001).
¶3 Cooper has waived his inadequate-medical-care claim by failing to brief it on appeal. See Yohey v. Collins, 985 F.2d 222, 225 (5th Cir.1993).
¶4*985 Based on the foregoing, the district court’s judgment is AFFIRMED.