Han alleged he faced retaliation after reporting suspected violations internally and later raising concerns while disputing a performance notice from his supervisor. Pfizer terminated him citing performance deficiencies, pointing to years of repeated feedback across multiple evaluations and supervisor criticisms that existed before any whistleblowing occurred. The court acknowledged Han engaged in protected activity but granted Pfizer's motion because the company met the demanding evidentiary standard required to prove the termination would have happened anyway.
The decision carries weight for how California courts apply the state's whistleblower protection statute. While the California Supreme Court's Lawson v. PPG Architectural Finishes decision made it easier for employees to prove retaliation by showing protected activity was a contributing factor, Han demonstrates employers can still prevail by maintaining thorough, contemporaneous documentation of performance issues. For in-house counsel and employment lawyers, the ruling underscores a practical reality: robust documentation of employee deficiencies before any protected activity occurs remains the most effective defense against retaliation claims, even when whistleblowing is established.