Quick Answer: The Utah VPN law (SB 73) was blocked by a federal judge because it required websites to perfectly identify and block users hiding their location via VPNs. Since perfect geolocation is technically impossible, the law unconstitutionally forced platforms to either block all global VPN traffic or verify the age of every internet user worldwide.
State legislators frequently try to legislate the laws of physics, but they rarely attempt to rewrite TCP/IP. When the Utah VPN law passed, it handed compliance and network engineering teams a mandate that looked simple on paper but was fundamentally broken in practice. You cannot force a destination server to magically divine the true origin IP of an encrypted tunnel without breaking the fundamental architecture of the internet.
Here is what actually matters about the federal injunction against Utah's SB 73, and why this ruling sets a massive precedent for how states can—and cannot—regulate digital borders.
The Mechanics of SB 73 (And Why It Broke)
Signed into law earlier this year, Utah's SB 73 attempted to regulate adult websites by forcing them to implement strict age verification mandates. But the state went a step further than its predecessors. Lawmakers recognized that users simply fire up a Virtual Private Network (VPN) to bypass state-level geofencing.
To counter this, SB 73 required platforms to actively detect and block VPN users, or definitively identify the physical location of visitors using tools that mask their network traffic. It even banned websites from publishing instructions on how to bypass state website blocks.
This next part trips people up every time. The law did not just ask platforms to try their best. As Judge Barlow noted in his preliminary injunction, the statute essentially imposed strict liability on entities for determining the location of their users.
If you manage a production network, you already see the fatal flaw. VPNs protect user privacy by routing web traffic through intermediary servers. The destination website only sees the IP address of the VPN exit node. The server has zero reliable mechanism to tell whether that TCP handshake originated from Salt Lake City, London, or Tokyo.
By demanding perfection in the absence of perfect geolocation tools, the state forced platforms into an impossible binary: completely block all VPN traffic globally, or withdraw access from Utah entirely.
The "Perfect Geolocation" Fallacy
The administrative rules drafted by the Utah Department of Commerce (specifically R152-78B) compelled commercial entities to implement "commercially reasonable geolocation obfuscation detection systems."
When you look at the actual detection heuristics suggested by regulators—such as monitoring connection latency or checking for device time-zone mismatches—the technical ignorance becomes glaring. Network latency fluctuates wildly based on ISP routing, network congestion, and hardware.
Here is a breakdown of why standard geolocation methods fail when applied as strict legal filters:
| Detection Method | Technical Accuracy | False Positive Risk | Production Viability |
|---|---|---|---|
| IP Database Lookup | High for residential IPs | Low | Industry standard, but blind to VPN origins. |
| Latency Heuristics | Extremely Low | High (punishes rural users and mobile networks) | Unreliable for legal compliance. |
| Time-zone Mismatch | Low | High (flags travelers and remote workers) | Easily spoofed by the client browser. |
| Deep Packet Inspection | Medium | High (breaks legitimate encrypted traffic) | Too resource-intensive at scale. |
The Electronic Frontier Foundation detailed this exact technical impossibility in their formal comments to the Department of Commerce. You cannot build a compliance framework on top of network jitter. If you try, you end up blocking legitimate users on corporate split-tunnels or Apple's iCloud Private Relay.
Strict Liability and the Splinternet Effect
Here is where most guides go wrong when discussing state internet laws. They focus entirely on the local impact. But the internet does not have state lines, and the U.S. Constitution has a specific mechanism for dealing with this: the Dormant Commerce Clause.
The Aylo lawsuit against SB 73 (filed by the parent company of major adult platforms) highlighted a staggering data point. To comply with Utah's demand to keep minors out, Aylo would need to verify the age of its 28 million daily users globally. Because the platform cannot definitively prove a VPN user isn't in Utah, they have to treat every anonymous user on Earth as if they might be in Utah.
This is the definition of an unconstitutional burden on interstate commerce. A single state cannot pass a law that dictates how a business interacts with a user in Boston, Anchorage, or Honolulu.
When a state demands geolocation perfection, they are effectively demanding a "splinternet"—a fragmented web where users must present a digital passport at every state border. The federal court recognized this overreach immediately, ruling that Utah has less-burdensome ways to protect minors than forcing the entire globe to submit to age verification.
Why "Commercially Reasonable" Detection Fails in Production
That said, there's a real catch here for compliance teams. Regulators love the phrase "commercially reasonable." It sounds pragmatic. But in the context of geolocation obfuscation detection, it is a trap.
I have seen engineering teams attempt to build these detection systems to appease aggressive regulators. The failure modes are always identical.
First, you subscribe to a commercial VPN IP database. You block known exit nodes. Within 48 hours, the VPN providers rotate their IP pools. You are now playing a permanent game of whack-a-mole.
Next, you implement the state's suggested latency checks. Suddenly, your customer support queue is flooded. Why? Because a user on a satellite internet connection in rural Nevada has the same latency profile as someone routing traffic through a proxy server. You have built a system that actively discriminates against users with poor internet infrastructure.
The part politicians don't advertise is that VPNs are not just for bypassing age gates. They are fundamental security tools used by journalists, remote workers, and individuals protecting themselves on public Wi-Fi. Mandating the blanket blocking of these tools degrades the overall security posture of the internet.
The Privacy Paradox: Mandating Surveillance
Most people stop at the technical failure of the law—don't. The most dangerous aspect of the Utah VPN law is the privacy paradox it creates.
To enforce age verification mandates, the state is forcing platforms to surveil their users more aggressively. If a user employs a VPN to minimize their digital footprint and avoid invasive data collection, SB 73 dictates that the website must deploy more invasive tracking (like browser fingerprinting and latency monitoring) to unmask them.
You are forcing platforms to act as an extension of the state's surveillance apparatus. As the Electronic Frontier Foundation correctly argued, this turns genuine privacy concerns into compliance theater.
When you mandate invasive tracking to enforce a local law, you normalize dragnet surveillance. Users will always find ways to route around censorship. The tools will simply adapt, moving from commercial VPNs to decentralized networks and Tor, making the state's framework fundamentally unsustainable.
Frequently Asked Questions
What is the Utah VPN law (SB 73)?
Utah's SB 73 is a state law that requires adult websites to verify the age of visitors. Uniquely, it mandates that platforms must detect and block users who use Virtual Private Networks (VPNs) to hide their location, or face strict legal liability.
How do age verification mandates detect VPNs?
Platforms typically rely on IP address databases that track known VPN exit nodes. Some regulators also suggest using latency heuristics or browser time-zone mismatches to guess if a user is hiding their location, though these methods are highly inaccurate and prone to false positives.
Why do state internet laws fail technically?
State internet laws fail because the internet's architecture (TCP/IP) does not transmit geographic borders. When states demand perfect geolocation, they ignore that network traffic routing is dynamic and easily obfuscated by standard, legal privacy tools.
Can a state legally ban the use of a VPN?
While states can attempt to regulate how businesses interact with VPN users, outright banning VPNs or forcing global platforms to block them often violates the U.S. Constitution's Dormant Commerce Clause by burdening out-of-state commerce.
The Path Forward for Compliance
The federal injunction against the Utah VPN law proves that courts will not allow states to mandate technical impossibilities. You cannot legislate perfect geolocation into existence, and you cannot force global platforms to break user privacy just to enforce a local geofence.
For engineering and legal teams navigating this fractured landscape, the takeaway is clear: prioritize standard, commercially available IP filtering, but aggressively push back against mandates that require active network surveillance or latency heuristics. Document your false-positive rates and be prepared to show regulators exactly why their proposed detection methods fail in production.
Review your current geofencing architecture this week and note the result of your VPN blocking rules. If you are catching legitimate corporate traffic in your filters, your heuristics are too aggressive. Read our breakdown of compliance engineering strategies next, or pass this analysis to your legal team if they are wrestling with state-level privacy legislation tracker requirements.