Disclaimer: General information, not legal advice. If you’re in an actual trade secret dispute, talk to counsel before you talk to opposing counsel (or the internet).

Trade secret lawsuits have the weirdest job interview question in law: “Please describe your secret… in public… while insisting it’s still secret.” California’s answer is a tough-love statute that forces early specificity. Federal law, meanwhile, is more “we’ll get therecarefully.”

In 2025, the Ninth Circuit sharpened that contrast. In Quintara Biosciences, Inc. v. Ruifeng Biztech, Inc., the court held that California’s CUTSA pre-discovery disclosure rule (the “reasonable particularity” requirement in California Code of Civil Procedure § 2019.210) does not control a DTSA-only claim. Translation: if you sue under the federal Defend Trade Secrets Act (DTSA) without bringing a California Uniform Trade Secrets Act (CUTSA) claim, a court can’t simply import California’s statutory timing rule and strike your alleged trade secrets at the start of discovery.

Let’s unpack what this “DTSA vs. CUTSA split” really means, why it happened, and how it changes the early-game strategy in Ninth Circuit trade secret litigation.

DTSA vs. CUTSA: Similar Goals, Different Timing Rules

DTSA (enacted in 2016) created a federal civil cause of action for trade secret misappropriation. It lives in federal court and applies when the trade secret relates to a product or service used in (or intended for) interstate or foreign commerce. DTSA doesn’t preempt state trade secret laws; it supplements them.

CUTSA is California’s trade secret statute. The key extra feature for California litigators is Code of Civil Procedure § 2019.210, which requires a plaintiff to identify the alleged trade secret with “reasonable particularity” before taking discovery “relating to the trade secret.” In practice, that often triggers an early “tell me what your secret is” showdown before the case can move.

So the core question becomes: when a trade secret case is filed in federal court, do we use California’s “reasonable particularity before discovery” gatekeeping for everything? Or do we follow DTSA’s text and the ordinary Federal Rules of Civil Procedure?

The Ninth Circuit’s Answer, Delivered via a Biotech Breakup

In Quintara, two California DNA-sequencing-analysis companies worked together from 2013 to 2019. After the relationship soured, Quintara alleged that Ruifeng locked it out of an office, took equipment, hired Quintara employees, and misappropriated trade secrets. Quintara sued in the Northern District of California and pleaded only a DTSA misappropriation claimno CUTSA claim.

The early dispute: “Name your secrets, then we’ll talk discovery.”

At the Rule 26(f) conference, the parties debated whether Quintara had to comply with CUTSA’s § 2019.210 “reasonable particularity” disclosure standard at the outset. The district court ordered Quintara to provide detailed trade secret disclosures (including a request that the “precise claimed trade secrets” be listed like patent claims). Quintara expanded its descriptions and filed an amended disclosure under seal. Ruifeng still objected.

To break the discovery stalemate, the district court effectively offered Ruifeng a gamble: accept the disclosure and proceed, or move to strike and “accept the consequences if wrong.” Ruifeng moved to strike under Rule 12(f). The court, borrowing California’s § 2019.210 framework, struck nine of the asserted trade secrets and let only two proceed. After discovery and trial on what remained, a jury returned a defense verdict on the last surviving trade secret.

On appeal, the Ninth Circuit reversed the striking/dismissal move (and affirmed the denial of a mistrial on a separate issue). The key trade secret holding is what’s making waves.

What the Ninth Circuit Held

1) DTSA doesn’t require CUTSA-style pre-discovery “reasonable particularity”

The Ninth Circuit acknowledged the “delicate problem” in trade secret cases: disclose too much too early and you hand your competitor a blueprint; disclose too little and the defendant can’t meaningfully defend. But the court emphasized that, by its terms, DTSA does not require a plaintiff to identify trade secrets with particularity from the start, unlike CUTSA’s statutory procedure.

That doesn’t mean DTSA is a “vibes-based” statute. The Ninth Circuit reiterated that DTSA plaintiffs must ultimately prove they possessed a trade secret and that it was described with “sufficient particularity” to separate it from general knowledge in the trade. The important timing point: whether the alleged secret is sufficiently particular is generally a fact question for summary judgment or trial, after discovery allows the parties to refine and clarify what’s actually at issue.

2) Rule 12(f) wasn’t the right tool

Rule 12(f) is designed to strike “redundant, immaterial, impertinent, or scandalous” matter from pleadings. Even if the disclosure were treated as part of a pleading, the Ninth Circuit found the district court didn’t identify anything Rule 12(f) authorizes striking. In short: “your trade secret description is not detailed enough” is not naturally a Rule 12(f) problem.

3) Striking nine trade secrets as a discovery sanction was an abuse of discretion

Yes, district courts have broad power to manage discovery under Rules 16 and 26, and they can impose sanctions under Rule 37. But dismissal (or its functional equivalent) is a harsh sanction reserved for extreme circumstances. The Ninth Circuit applied its usual multi-factor test for case-dispositive sanctions and concluded the record didn’t justify the penalty hereespecially where less drastic alternatives existed and the dispute looked like a merits question about particularity rather than defiance of court orders.

The punchline: in a situation like Quintara, a DTSA trade secret claim will rarely be properly dismissed as a discovery sanction just because the court thinks the disclosure is not yet particular enough.

Why This Is a “Split” Between DTSA and CUTSA (Not a Free Pass)

Quintara draws a bright line about where the timing rule comes from. CUTSA has a statute§ 2019.210that forces early “reasonable particularity.” DTSA doesn’t. If you bring CUTSA claims, expect the California statute to matter. If you bring only DTSA, the Federal Rules (plus DTSA’s elements) control the timing and mechanics.

But the Ninth Circuit also stressed that district courts are not helpless. They can:

• Phase discovery so the plaintiff provides an initial identification before broad merits discovery opens up.
• Use protective orders (including “attorneys’ eyes only”) to prevent competitive misuse of confidential material.
• Limit discovery to what’s proportionate under Rule 26 and push particularity issues to summary judgment if the plaintiff remains too vague after reasonable opportunities.

So the practical takeaway is not “no early identification ever.” It’s “don’t turn California’s statutory pre-discovery procedure into an automatic DTSA strike/dismissal engine.”

Concrete Examples: Vague vs. “Sufficiently Particular”

Courts (and defendants) don’t love “catchall” trade secret descriptions. Compare:

Too vague

“Our proprietary customer database and marketing strategy.”

Closer to workable

“A customer scoring model that ranks leads using (1) channel-weighted conversion probabilities, (2) purchase-frequency decay rates, and (3) region-specific price-sensitivity coefficients, implemented in a specific SQL schema with a defined set of calculated fields and update rules. The claimed secret excludes public contact information and off-the-shelf CRM fields.”

You don’t have to publish your whole playbook on day one. But you do have to show the court you’re not claiming “everything we do is secret,” and you need enough boundaries for discovery to be targeted.

SEO-Friendly Practical Guidance: What to Do After Quintara

If you’re the plaintiff

• Pick your statutes deliberately. DTSA-only may reduce early § 2019.210 fights, but CUTSA can offer strategic value too (and may affect preemption of related claims).
• Offer a staged plan. Propose early limited discovery (e.g., access logs, device imaging protocols) paired with progressively more detailed disclosures.
• Document secrecy measures. NDAs, access controls, compartmentalization, and training are not optional background facts; they are part of your trade secret story.

If you’re the defendant

• Ask for case-management structure, not shortcuts. Seek phased discovery and a disclosure schedule under federal rules rather than a blunt motion to strike.
• Lock in a strong protective order early. Many trade secret cases are won (or at least made survivable) in the confidentiality framework.
• Keep summary judgment in mind. If the plaintiff can’t define the secret with sufficient particularity after discovery, that’s where the merits pressure lands.

Conclusion

The Ninth Circuit’s Quintara decision clarifies a practical and high-stakes point: California’s CUTSA statute forces early “reasonable particularity” disclosure, but DTSA does not impose that same pre-discovery timing rule by default. Courts still have robust tools to manage trade secret discovery and prevent fishing expeditions, but striking and functionally dismissing DTSA trade secrets at the outsetbecause a disclosure doesn’t meet § 2019.210goes too far.

If you litigate trade secret misappropriation in the Ninth Circuit, this split matters on day one: it affects pleading strategy, discovery sequencing, and how quickly you can get to the evidence that proves (or disproves) misappropriation.

500-Word Add-On: “Experiences” From the Trade Secret Trenches

Even with clear legal rules, trade secret cases feel like a three-way tug-of-war between speed, secrecy, and specificity. Here are common, real-world experiences companies and litigators run intoespecially in California federal courtnow framed by the DTSA/CUTSA split the Ninth Circuit highlighted.

1) The “we know it when we see it” trap. Inside a business, a trade secret is often a bundle of habits: a workflow, a spreadsheet, a script, and a few unspoken rules the team follows because “that’s how we do it.” In litigation, that bundle has to become a description with boundaries. Many plaintiffs discover (painfully) that their first disclosure reads like a marketing brochure“innovative,” “proprietary,” “cutting-edge”with no technical edges. The fix is usually to translate internal know-how into concrete components: specific steps, specific data fields, specific thresholds, and specific combinations that create advantage.

2) Early discovery fights are really about fear. Plaintiffs fear that naming the secret too precisely will leak it to a competitor. Defendants fear that vague allegations will open a fishing expedition into their own confidential systems. That’s why California’s § 2019.210 has historically been such a pressure point. After Quintara, DTSA-only cases may move toward “controlled iteration”: limited early discovery (often forensic or access-focused) plus a court-managed schedule for tightening trade secret definitions as the evidence develops. The emotional temperature drops when the process feels fair and contained.

3) Protective orders do more work than closing arguments. The best-run cases usually have an early protective order with clear tiers (Confidential vs. Attorneys’ Eyes Only), defined handling procedures, and a fast process for resolving designation disputes. Once both sides believe the other can’t casually hand sensitive material to the business team, the case stops being “no” versus “no” and becomes “yes, but under these rules.” Without that structure, every discovery request becomes a hostage negotiation.

4) Particularity often decides damages, not just liability. Even if misappropriation is shown, damages calculations depend on what was taken and how it was used. If the “secret” is described as a broad category (“all our pricing”), it becomes hard to prove incremental value, secrecy, and competitive harm. When the trade secret is defined as a specific method or dataset with clear edges, experts can more credibly connect it to avoided development costs, head-start periods, or unjust enrichment. In practice, “sufficient particularity” is often what turns a damages theory from hand-wavy to measurable.

5) Operational hygiene is litigation leverage. Companies that label and compartmentalize “crown jewel” information, track access, and enforce offboarding controls are in a better position both to identify trade secrets and to prove “reasonable measures” to keep them secret. If your secret sits in a folder that every intern can download at 2 a.m., you don’t just have a security problemyou have an evidence problem.

Bottom line: Quintara is a procedural decision with strategic effects, but the day-to-day experience doesn’t change the core truth of trade secret law: your strongest “secret” is the one you can define, protect, and explainwithout turning it into a public giveaway.

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