Sixth Circuit Eases Plaintiffs' ADA Burden; Proof Of 'Sole' Cause No Longer Required

The Sixth Circuit Court of Appeals recently adopted the "but for" causation standard for claims brought under the Americans with Disabilities Act (ADA). According to the federal appellate court with jurisdiction in Ohio, the plain language of the ADA does not provide that a plaintiff must prove that his or her disability was the "sole" cause of the adverse employment action. Lewis v. Humboldt Acquisition Corp., No. 09-6381, Sixth Circuit Court of Appeals (May 25, 2012).

Susan Lewis was employed as a registered nurse at one of Humboldt Acquisition Corporation's retirement homes. Humboldt dismissed Lewis based on an outburst at work, in which she yelled, used profanity, and criticized her supervisors. Lewis filed an ADA claim against Humboldt claiming that the grounds for her dismissal were a pretext for disability discrimination, and that the real reason that Humboldt terminated her employment was a medical condition that made it difficult for her to walk and that occasionally required her to use a wheelchair.

At trial, Humboldt asked the trial judge to instruct the jury that Lewis could prevail only if she proved that Humboldt's decision to fire her was "sole[ly]" because of her disability. Lewis, on the other hand, asked the court to instruct the jury that she could prevail even if she only proved that her disability was a motivating factor in her discharge. The trial judge rejected Lewis' instruction, finding that Sixth Circuit precedent required that Lewis prove her disability was the "sole" cause. The jury entered a judgment in favor of Humboldt.

The "sole cause" standard for proving ADA claims first was established in the Sixth Circuit in 1995 in Maddox v. Univ. of Tennessee, 62 F.3d 843 (6th Cir. 1995). In Maddox, the Sixth Circuit applied the...