The Pen-Register Defense Is Turning — What the Shift Means for Your Website
Something changed this cycle. For two years, the CIPA §638.51 "pen register" theory was the plaintiff bar's most reliable weapon against websites. Now a line of defense rulings — led by Rodriguez v. Ink America — is spreading, holding that CIPA can't criminalise what the CCPA already regulates. But federal courts still disagree. Here's the shift, the split, and what both mean for your site.
The shift this cycle
For most of the current CIPA litigation wave, the pen register theory under Penal Code §638.51 has been the plaintiff bar's favourite tool. Unlike a §631 wiretapping claim — which requires showing a third party read the contents of a communication in real time — the pen register theory needs only that a tool captured "addressing and routing information," a much lower bar that ordinary analytics and advertising pixels seem to meet. That asymmetry is why so many complaints lead with §638.51.
What's shifting is the defense response. A growing line of California state-court decisions — anchored by Rodriguez v. Ink America International Group — has started dismissing pen register claims outright, on a powerful new rationale: CIPA cannot be read to criminalise the very website conduct that the California Consumer Privacy Act (CCPA) expressly permits and regulates. If routine analytics were illegal "pen registers" absent a court order, then the CCPA's entire opt-out-and-notice framework would be nonsensical. Courts are increasingly unwilling to accept that.
We're not a law firm, and this is not legal advice. What we are is a team that tracks these decisions because each one tells website operators something concrete about their risk. This issue steps back from the case-by-case grind to name the trend that matters this cycle — and, just as importantly, the two big reasons it doesn't let most sites relax.
The Good: A defense rationale with real momentum
The most important development for website operators isn't a single case — it's a pattern of courts adopting the same defense reasoning. The pen register theory, which looked nearly unstoppable a year ago, is now being dismissed at the pleading stage in state court with increasing regularity.
Rodriguez v. Ink America International Group
This is the decision the whole trend is built on, and it's worth understanding why it lands so hard. The plaintiff alleged that Ink America's website used analytics and beacon tools that collected IP addresses and device identifiers — the standard pen register fact pattern. The court didn't just dismiss; it granted judgment on the pleadings and denied leave to amend, meaning the plaintiff couldn't re-plead their way around it.
The reasoning that's spreading: the court found CIPA's pen register language genuinely ambiguous when applied to modern websites, and resolved that ambiguity by looking at legislative intent and California's broader privacy framework. Its conclusion was blunt — treating routine analytics as criminal "pen registers" would mean the CCPA "punishes compliance," because the CCPA expressly contemplates that businesses collect this exact data with notice and opt-out rights. The court held the statute "did not, and does not, criminalise the process by which websites communicate with users who choose to access them," and leaned on the §638.51(b) service-provider exception, which website operators plausibly fall within.
Because Rodriguez is a trial-court decision, it isn't binding precedent — but its reasoning is portable, and other courts are picking it up.
There's now a strong, reusable defense to the pen register theory — but it's a litigation defense, not a compliance substitute. If your site is sued on a §638.51 theory, your counsel has significantly better authority to cite than they did a year ago. That's genuinely good news. It does not, however, stop a demand letter from landing, and it doesn't help at all against the §631 and consent-gap theories the Rodriguez rationale doesn't touch.
Heiting v. Wildflower Brands
Wildflower is the case that shows the trend isn't a one-off. Notably, it came just days after a different L.A. Superior Court judge issued a mixed ruling against the same company (Balabbo v. Wildflower Brands), where the pen register and wiretapping claims were dismissed but a common-law invasion-of-privacy claim survived. In Heiting, a different judge dismissed a near-identical CIPA case entirely and with prejudice.
The court's rationale echoed Rodriguez and sharpened it: CIPA's pen register and trap-and-trace provisions were designed for telephone surveillance, not commercial websites. The judge pointed to the telephone-specific language governing how law enforcement obtains authorisation for these devices as evidence the legislature never intended them to reach website analytics — and noted that the internet was already in wide use when these provisions were enacted in 2015, yet the legislature said nothing about websites.
The defense reasoning is now appearing across multiple judges, not just one. That's what turns a single helpful ruling into a genuine trend. But note the split within the very same litigation: Balabbo let a common-law privacy claim survive even as the CIPA claims fell. Dismissing the CIPA pen register theory doesn't necessarily dispose of every privacy claim — especially where sensitive data is involved.
A better defense doesn't close the pre-consent gap
The Rodriguez line helps in court — but it doesn't stop trackers firing before consent, which is what plaintiff scanners look for first. See what fires on your site before the banner renders, the same way they do. About 10 seconds, no account.
Scan your site free →The Bad: The federal split hasn't closed
Here's the catch that keeps this from being a clean win. The Rodriguez line is a state-court phenomenon. In federal court, the pen register theory is still very much alive — and federal judges have repeatedly held that CIPA's §638.51 does reach web-based tools like pixels. The result is an unresolved state–federal split that determines outcomes as much as the facts do.
The federal §638.51 line (per Holland & Knight's tracking)
Federal district courts in California have consistently found that CIPA's definition of "pen register" encompasses web-based technologies such as pixels — the opposite of the state-court trend above. One federal judge recently denied a defendant's request to certify the question for interlocutory appeal, finding there weren't "substantial grounds for difference of opinion" among the federal courts — a striking statement given how sharply federal and state courts diverge.
The one thing complicating the plaintiff side even in federal court is Article III standing. Following the Ninth Circuit's Popa v. Microsoft decision, defendants can argue a plaintiff who alleges only generic device/browser metadata hasn't suffered a concrete injury. But federal judges apply Popa inconsistently — some dismiss §638.51 claims for lack of standing, others find the same boilerplate allegations sufficient. So even the standing escape hatch is unreliable.
Which courthouse your case lands in can matter more than what your site actually does. A pen register claim that would be dismissed in L.A. Superior Court may well survive in a California federal court. Since plaintiffs often choose the forum, you can't count on the Rodriguez line saving you — and the standing defense is a coin-flip. The durable protection isn't a favourable court; it's not generating the fact pattern in the first place.
The Ugly: The shift doesn't touch your biggest exposure
Here's the uncomfortable truth that every headline about "CIPA wins for business" tends to bury. The Rodriguez line is about the pen register theory and routine analytics data. It does essentially nothing for the two configurations that produce the worst outcomes: session-replay on checkout pages (a §631 contents problem) and pre-consent firing (the gap that sinks even sites with a banner).
Session-replay on checkout — the §631 exposure that hasn't moved
Recall from Issue 01 that the Ninth Circuit's reversal in Mikulsky v. Bloomingdale's let a §631 session-replay claim proceed, finding plaintiffs adequately alleged that the vendor intercepted the contents of checkout communications — names, addresses, card details — in real time. Nothing in the Rodriguez pen register trend changes that. These are two different theories, and the contents theory is the one where checkout keystroke capture lives.
This is the crucial point for retailers: a defense win on §638.51 pen register does not insulate a session-replay tool running on a payment page. The Rodriguez reasoning — "this is just how websites communicate" — is far less persuasive when the tool is recording exactly what a visitor types into a credit-card field. Sensitivity of the captured data is precisely what keeps these claims alive, consistent with the financial-data pattern (Capital One) covered last issue.
If you run any session-replay tool on checkout, login, or form pages, the good news above doesn't apply to you. That configuration remains the single highest-risk setup in CIPA litigation, and the pen register defense trend gives you no cover for it. Consent-gate those tools, or exclude sensitive pages from recording entirely.
The patterns: what's changed, what hasn't
Zooming out across this cycle and the broader body of case law tracked on our CIPA Lawsuit Tracker, here's the honest state of play — where the ground moved, and where it didn't.
| Theory / configuration | Where it stands now | Risk |
|---|---|---|
| §638.51 pen register — routine analytics, state court | Defense trend rising — Rodriguez line dismissing at pleadings | Improving |
| §638.51 pen register — same facts, federal court | Still frequently surviving; standing defense inconsistent | High |
| §631 wiretapping — vague "browsed the site" pleading | Regularly dismissed for failing the contents element | Lower |
| §631 session-replay — checkout / form keystroke capture | Unchanged — highest-risk; claims proceeding to discovery | Critical |
| Pre-consent firing — banner present but trackers fire first | Unchanged — the AEG gap; pen-register trend gives no cover | Critical |
| Sensitive data — financial / health + third-party trackers | Unchanged — standing challenges fail; claims survive | Critical |
The single most consistent variable — still
Last issue's conclusion holds, and this cycle reinforces it from a new angle. The pen register defense trend is real and worth celebrating in the courtroom — but notice what it doesn't change: every critical-risk row above is untouched by it. The variable that still separates dismissed sites from sites in discovery isn't the theory du jour. It's whether tracking started before the visitor had a chance to consent, and whether sensitive data was captured by a third party. Those are technical facts you control in advance, not legal arguments you hope a friendly judge accepts later.
What to do right now — based on this cycle
The pen-register shift changes what your lawyer can argue. It doesn't change what you should do. If anything, it clarifies the priority: fix the fact pattern, because you can't pick your courthouse.
Don't relax because of the headlines
"California courts limit CIPA" makes a great headline, but it describes a state-court trend on one theory. Federal pen-register claims, §631 session-replay claims, and pre-consent-gap claims are all unaffected. Read the defense wins as encouraging, not exonerating.
Close the pre-consent gap first
Open your site in an incognito window with DevTools on the Network tab, reload, and look at what fires before you touch the consent banner. If GA4, Meta Pixel, Hotjar, or any tracker appears, your banner is cosmetic — the exact gap no pen-register ruling repairs.
Get session-replay off sensitive pages
The one configuration the good news doesn't cover. Use URL-exclusion settings to remove Hotjar, Clarity, FullStory, or Lucky Orange from /checkout/, /my-account/, and any form or payment page — or consent-gate them so they never run before opt-in.
Keep the consent record
The Rodriguez defense is one arrow; documented pre-consent is another, and it works in any forum. A timestamped log of who consented, to what, and when is the evidence base a consent defense actually needs — in state or federal court alike.
The take from July 2026: a better defense, not a lower risk
This cycle handed website operators something real: a spreading, reusable defense to the pen register theory that dominated the last two years. In state court, on routine analytics facts, the ground has genuinely shifted toward businesses — and Rodriguez gives your counsel authority that didn't exist a year ago.
But the shift is narrower than the headlines suggest. It's a state-court trend on one theory. Federal courts still uphold pen-register claims, the session-replay contents theory is untouched, and the pre-consent firing gap loses in every forum. A better legal argument is not the same as a lower actual risk.
The move that protects you in any court is the same as it was last issue: don't fire trackers before consent, keep session-replay off sensitive pages, and document the consent you obtain. The defense trend is a bonus on top of that posture — never a replacement for it.
We'll publish the next CIPA Case Watch issue covering the decisions and developments of July 2026 — including any appellate movement on the state–federal §638.51 split, which is the single development most likely to reshape this entire area. For the full, continuously updated case database, see our CIPA Lawsuit Tracker.
Is your site firing before consent?
No pen-register ruling fixes a tracker that fires before the banner renders. Run the same scan a plaintiff firm would — in about 10 seconds.
Free site scan →Legal disclaimer: This article is published for informational purposes only and does not constitute legal advice. Case summaries are based on publicly available court decisions and legal reporting, including analysis published by Fisher Phillips LLP, Inside Class Actions, Holland & Knight, and the Washington Legal Foundation. Rodriguez v. Ink America International Group LLC was decided by the Los Angeles County Superior Court. ConsentPixel — Privacy · Verified is not a law firm and does not provide legal counsel. CIPA litigation is fact-specific and rapidly evolving; for advice on your situation, consult a qualified privacy attorney.