How Wearable Devices Are Reshaping Personal Injury Law

“Ninety-nine percent of crime will now have a digital component. We have these little sensors all over. We’re wearing them and they’re in our homes.” — Jonathan Rajewski, digital forensics instructor, Champlain College

That observation was about criminal investigations, but anyone working in civil personal injury law could borrow it almost word for word. The sensors Rajewski is talking about are sitting on roughly thirty percent of American adults right now. They are quietly recording steps, heart rate, sleep stages, location, and movement patterns by the second. When an injury claim ends up in litigation, that data is increasingly the first thing both sides try to access.

The point of this piece is to walk through what the numbers actually show about wearables and injury claims, where the evidence has been used, and what claimants and counsel should be aware of as the trail keeps getting denser.

The Numbers Tell a Bigger Story Than Most People Realize

Wearables stopped being a niche category somewhere around 2018. By 2025, they were ordinary household objects.

If you sketch the adoption trajectory visually, the change is hard to miss:

That curve is what is driving the change in injury litigation. A decade ago, asking a claimant whether they had data on their daily activity levels was unusual. Today, it is one of the first questions both plaintiff counsel and defense counsel quietly ask.

Accuracy Cuts Both Ways and So Does the Evidence

One of the more useful things about looking at this honestly is that wearable data is not always flattering for either side. Independent testing of the major brands has shown meaningful accuracy variations that any thorough cross-examination is going to bring up.

The takeaway is not that the data is unusable. It is that the data has known limits, and any case built on it should anticipate those limits being introduced as a counter-argument in court.

This cuts in both directions. A plaintiff trying to show reduced activity post-injury can find their wearable data backing them up cleanly, except for one weekend when the device misread car-passenger movement as exercise. A defendant trying to suggest a plaintiff is exaggerating injuries can point to step counts that look “active,” only to discover those steps came from a noisy sensor reading or a passenger ride. Modern personal injury practice has had to learn to read this data the way it once learned to read radiology reports: closely, with specialists, and skeptical of any single data point.

Local Counsel and the Discovery Calendar

Wearable evidence does not preserve itself. Every major device platform, including Apple Health, Fitbit, Garmin Connect, Oura, Samsung Health, and Google Fit, has its own data retention rules, its own export procedures, and its own response timelines for legal requests. Some platforms keep granular data for years. Others compress or roll off detailed records over a much shorter window. If a case is going to rely on wearable evidence, that calendar starts running on the day of the injury, not the day the case gets filed.

California in particular has a discovery regime that rewards counsel who move quickly. Civil procedure in the state allows broad discovery of relevant information, and electronically stored information is explicitly within scope. The practical effect is that the side that requests, preserves, and analyzes wearable data first generally has the better case. Working with a San Luis Obispo Personal injury lawyer familiar with electronic discovery in California, who knows the major platforms’ export procedures, and who has experience working with forensic technologists on wearable data analysis, makes a measurable difference in the strength of the resulting case. The first sixty days after an injury are usually the window in which the most consequential decisions about evidence get made.

This is true on the defense side as well. Carriers and defense counsel have started issuing early data preservation requests of their own, often before a complaint is filed. The era in which wearable data quietly sat on a server while everyone argued about the injury report has ended.

The Privacy Layer Is Still Catching Up

It is worth saying clearly that wearable data sits in a legal gray zone the privacy laws were not really designed for. HIPAA covers protected health information held by healthcare providers, plans, and certain business associates, but data on a consumer fitness device generally falls outside it. Each platform’s terms of service govern what gets shared, with whom, and under what legal compulsion. A subpoena or court order generally unlocks the data, regardless of how the user expected it to be treated.

For claimants, the practical implication is that anything tracked is potentially producible. For everyone else, including those of us who simply wear these devices every day, the broader implication is that the data we generate is functioning as a quiet ambient record of our lives. The legal system has spent the last decade learning to use that record. The privacy framework around it is still being written, mostly by individual platforms, occasionally by state legislatures, and only rarely by Congress.

Closing Words

Rajewski’s “ninety-nine percent of crime will now have a digital component” was a forecast when he said it. In the civil personal injury world, the equivalent line is closer to “ninety-nine percent of injury claims will now have a digital component, whether the parties want them to or not.” The wearable on the plaintiff’s wrist, the smartwatch on the defendant driver’s wrist, the phone in every pocket at the scene, the connected car parked nearby, together they form an evidence trail that almost no claimant or carrier will be able to ignore in the years ahead.

That is the new shape of the injury evidence trail. The numbers in section two are the early evidence of where it is going. The cases in section three are the early evidence of how it gets used. The accuracy table in section four is a reminder that the data has limits. What happens next will be determined by the speed at which lawyers, judges, insurers, and the rest of us adapt to a record that is now ambient, continuous, and quietly precise.