Courts Stress Trade Secret Owners Must Act on Suspicion to Avoid Statute of Limitations Bar

Trade secret owners face a critical obligation to actively investigate any suspicions of theft to avoid losing their right to sue under the Defend Trade Secrets Act (DTSA) and similar state statutes. These laws generally impose a three-year statute of limitations for filing claims, but the clock starts not at the moment of actual misappropriation, but when the owner discovers or should have discovered the wrongful conduct, pursuant to the discovery rule codified at 18 U.S.C. § 1836(d).

Recent federal court decisions have clarified that the limitations period may begin as soon as a plaintiff harbors suspicion of misappropriation—even if definitive proof is lacking. This standard is lower and triggers an earlier timeline than many trade secret owners anticipate. Determining when suspicion arises is a fact-intensive inquiry, but courts have held that even evidence insufficient to prove misappropriation can start the clock. For example, in Elite Semiconductor, Inc. v. Anchor Semiconductor, Inc., 2025 U.S. Dist. LEXIS 6608 (N.D. Cal. Jan. 13, 2025), the court found that the statute of limitations began when Elite Semiconductor became aware of a third-party patent application describing its trade secrets in detail.

In Elite Semiconductor, the plaintiff’s CEO received a copy of the defendant’s patent application and an analysis comparing it to Elite’s technology. The CEO declared the application was based on Elite’s misappropriated trade secrets, and the plaintiff’s technical expert conceded the patent application detailed Elite’s proprietary information. The court emphasized that any reasonable company presented with such a patent application should be suspicious and promptly investigate. The ruling distinguished cases where trade secrets appeared in patent applications unknown to the owner, clarifying that discovery of the application imposes a duty to investigate.

The court further stressed that it is suspicion—not proof—that triggers the statute of limitations. Plaintiffs cannot delay investigation simply because they lack access to the defendant’s documents or because independent invention is possible. This principle underscores the necessity for trade secret owners to proactively seek facts rather than passively wait for evidence to emerge.

Similarly, in OrbusNeich Medical Co. v. Boston Scientific Corp., 694 F. Supp. 2d 106 (D. Mass. 2010), the court denied a motion to dismiss where the plaintiff had no reason to suspect misappropriation despite the defendant’s patent applications containing allegedly confidential information. The court held that a duty to investigate patent applications arises only when sufficient facts provoke a reasonable person to inquire.

In Gabriel Technologies Corp. v. Qualcomm Inc., 857 F. Supp. 2d 997 (S.D. Cal. 2012), the court granted summary judgment for defendants after finding the plaintiff had actual or constructive suspicion based on internal emails and license renegotiations but failed to investigate. The plaintiff’s chief technology officer emailed that a defendant’s product was a “direct rip-off” of their work but did not pursue further inquiry, dismissing the suspicion as unimportant. The court rejected the plaintiff’s argument that the suspicion was mistaken, noting the trade secret was broadly defined as a “general concept.”

Additionally, the plaintiff’s chief financial officer became suspicious during license renegotiations when the defendant sought to remove “proprietary rights” language. Meetings with trial counsel and deposition testimony confirmed the CFO’s suspicion. The court disregarded affidavits attempting to downplay this as mere “business suspicion,” labeling them “sham affidavits.”

These cases collectively demonstrate that courts will impute knowledge of misappropriation to plaintiffs who fail to conduct reasonable investigations once suspicion arises. Evidence supporting imputation includes explicit emails expressing suspicion, deposition admissions by employees, internal communications referencing investigations, and meetings with counsel following suspicious events.

Trade secret owners must therefore act promptly upon any indication of wrongdoing. Failure to investigate can result in dismissal or summary judgment based on statute of limitations grounds, even if the plaintiff ultimately could have proven misappropriation. The guiding maxim is clear: plaintiffs must find the facts themselves; they cannot wait for the facts to find them.