In United Texas Southwestern Medical Center v. Nassar, the Supreme Court ruled that the anti-retaliation provision of Title VII requires “but-for” causation. In other words, an unlawful reason has to be the reason for the adverse employment action. The Supreme Court had previously ruled that this type of “but-for” causation also is required in cases alleging age discrimination.
It does not, however, apply to cases of discrimination brought pursuant to Title VII. In those cases, the unlawful reason need only be a reason. There may be other, lawful reasons, but if an unlawful reason plays a part in the decision, then the decision is unlawful.
Here’s how it plays out. Let’s say that I go to work for a new law firm. My new boss doesn’t think that women lawyers are worth much. He also really hates my nose ring (despite how lovely and not at all offensive it looks in person). Based on those two prejudices, he decides to not put me up for a promotion.
If I sued for gender discrimination under Title VII, I could meet my burden by showing that I did not get the promotion because of I’m a woman-even if he also decided not to promote me because of the nose piercing. That’s a mixed motive and that’s sufficient to establish a discrimination claim under Title VII.
The burden is different, however, if I had brought the claim as an age-as opposed to gender-claim. If I had alleged that he had not promoted me because of my age and he had argued that it was only a little about it my age but most it was because of my nose ring, I’d lose.
And the same analysis now officially applies to retaliation claims under Title VII. An employee will not be able to succeed in a retaliation claim by arguing that her supervisor harbors a bias against, for example, women. Instead, that bias must be the reason for the retaliatory act.
All that being said, here’s the real deal. This is another decision by the Supreme Court this term that affects the burden of persuasion in employment lawsuits. The Nassar decision, like Vance, is a true victory for employers in defending against meritless lawsuits brought current and former employees.