Whether the NLRA permits the Board to require an employer in a mixed-motive discharge case to prove that it would have discharged the employee even absent the employee’s protected union activity.
Holding
Yes. The Board permissibly treats the employer’s same-decision showing as an affirmative defense on which the employer bears the burden of persuasion by a preponderance of the evidence.
Reasoning
Sections 8(a)(1) and 8(a)(3) make it unlawful for an employer to interfere with protected union rights or to discriminate in employment in order to encourage or discourage union membership. The Board has long construed those provisions to prohibit a discharge motivated, at least in part, by antiunion animus. The General Counsel therefore establishes the elements of an unfair labor practice by proving that protected activity was a substantial or motivating factor in the employer’s decision.
The Court distinguished that initial showing from the employer’s claim that it would have made the same decision for legitimate reasons alone. That claim does not add an element to the General Counsel’s case; instead, it is an affirmative defense that allows an employer already shown to have acted partly from an unlawful motive to avoid a violation finding.
Section 10(c), which requires the Board to find an unfair labor practice on the preponderance of the testimony, does not forbid this allocation. The General Counsel still bears the burden of proving the unfair labor practice itself. Nothing in the statutory text or the relevant legislative history requires the General Counsel to disprove the employer’s same-decision defense in a mixed-motive case.
The Board’s approach was also reasonable because an employer that acted from an unlawful antiunion motive created the difficulty of separating lawful from unlawful causes. It is fair to place the risk of uncertainty on that employer rather than on the employee or the General Counsel. The Court found the framework analogous to Mt. Healthy City Board of Education v. Doyle, where, after a plaintiff showed that protected expression played a role in an adverse decision, the defendant had to prove it would have reached the same result anyway.
Although the Act might have allowed a different allocation of proof, the Board’s interpretation was at least permissible and therefore entitled to judicial deference. Federal Rule of Evidence 301 did not control because it defines the effect of presumptions rather than limiting an agency’s authority to allocate burdens of persuasion, and the Administrative Procedure Act provision concerning the proponent’s burden addresses the burden of producing evidence, not necessarily the ultimate burden of persuasion on an affirmative defense.