district court granted summary judgment for Defendant on Plaintiffs ADA claim, and dismissed Plaintiffs FMLA claim for failure to state a cause of action. Plaintiff appeals. We exercise jurisdiction under 28 U.S.C. § 1291. We affirm in part, reverse in part, and remand.
I.
In October 1996, a Department of Transportation (DOT) authorized medical examiner, Dr. Larry G. Stabler, evaluated Plaintiff as required by federal law and issued him a CMV operator’s medical certification. During the examination, Plaintiff disclosed he had been taking the anti-seizure medication Dilantin since the fall of 1995 to control focal seizures related to Lyme Disease. Dr. Stabler examined Plaintiff again in November 1997 for recer-tification. On the medical examination form, Plaintiff again disclosed his use of Dilantin, and, apparently for the first time, also indicated a history of “seizures, fits, convulsions or fainting.” Nevertheless, Dr. Stabler certified Plaintiff as physically qualified to operate a CMV.
Upon reviewing Plaintiffs 1997 certification, Defendant’s Occupational Health Coordinator (OHC) noticed that Plaintiffs examination record reported a history of seizures. The OHC sent a memo to Plaintiffs supervisor requesting additional information. In the memorandum, the OHC wrote that Plaintiff—
indicated a “yes” for seizures, convulsions, and for medications, fists Dilan-tin — an anticonvulsant. Seizures have never been indicated on previous physicals. The physical done a year ago, Dilantin was fisted “as precautionary measure for past history of Lyme disease.” According to the PDR (drug/medication reference), Dilantin is prescribed only for seizure control.
Responding to Defendant’s request for information, Plaintiffs neurologist, Dr. James E. Duncan, sent a letter to Defendant explaining that Plaintiff suffered from focal seizures. Focal seizures are episodes of jerking on the left side of the body without loss of consciousness. Dr. Duncan confirmed that Plaintiff was taking Dilan-tin, but indicated Plaintiff experienced warning symptoms prior to the onset of a seizure. Dr. Duncan also indicated Plaintiff had not suffered a focal seizure in the past two years.
On or about January 2, 1998, Defendant placed Plaintiff on sick leave while determining whether his history of seizures and use of antiseizure medication would permit him to continue working as a CMV operator. Effective January 30, 1998, while Plaintiff remained on sick leave, Defendant officially terminated Plaintiffs employment. According to Defendant, Plaintiff was not physically qualified to operate a CMV because Plaintiffs use of antiseizure medication necessarily prohibited him from meeting the physical requirements for CMV operators.
II.
Subchapter III of the Commercial Motor Vehicle Safety Act, entitled “Safety Regulation,” 49 U.S.C. §§ 31181-31148, authorizes the Secretary of Transportation to prescribe “minimum safety standards” to ensure “the physical condition of operators of commercial motor vehicles is adequate to enable them to operate the vehicles safely.” Id. § 31136(a)(3). To that end, Department of Transportation (DOT) regulations dictate that “[a] person shall not drive a commercial motor vehicle unless he is physically qualified to do so.... ” 49 C.F.R. § 391.41(a). Among other things, a person is physically qualified to drive a CMV if that person “[h]as no established medical history or clinical diag