Can the FBI put you in a federal case because your phone happened to be near a robbery? Yes, at least long enough to take a look at you. It happens through a reverse location order most people call a “geofence warrant.” One request can pull the coordinates of every device that pinged inside a drawn shape during a set window, and the first list often runs into the dozens or hundreds.
One of those phones belongs to the suspect. The rest belong to bystanders. Picture a warrant that returned 200 phones from a two-hour window around a bank job. That number is doing the heavy lifting in this piece. Every section comes back to it from a different angle, because the story of modern digital search is really the story of what happens to the other 199.
Most of the 200 Phones Were Never Suspects
A geofence warrant does not name a person. It names a place and a slice of time, then asks a tech company to hand back everyone who was inside it. The Chatrie case that reached the Supreme Court in 2026 started this way: an armed robbery outside Richmond, a warrant served on Google, and a return that pulled in users who had nothing to do with the crime. The suspect was in there somewhere. So were people who lived nearby, drove past, or stopped for gas.
Now scale it up. A busier scene, a longer window, and the same warrant produces a list closer to 200. Every one of those accounts gets some level of scrutiny before investigators narrow the field, and the paperwork trail from that scrutiny does not disappear when the case moves on.
Being on the List Is Not the Same as Being Charged
Ending up in the initial return is closer to being flagged than accused. Investigators usually work in stages: an anonymized list first, then a smaller set with movement paths, then subscriber details on the handful of accounts they still care about. Somewhere along the way, most of the 200 fall off. That does not always feel like relief to the person who gets a knock on the door and has to explain a lunch break.
The stakes climb fast when the underlying investigation is federal. Bank robbery, drug conspiracy, and arson cases routinely draw geofence returns, and a bystander who says the wrong thing to an agent can create a real problem out of nothing. Talking to a federal criminal defense attorney before answering questions is the boring, correct move, even if you are certain you did nothing wrong. The 199 innocent phones in the return still generated interviews, and interviews generate transcripts.
The Fourth Amendment Now Has Something to Say
The constitutional status of geofence warrants was genuinely up in the air for years. Different circuits went different ways. In June 2026 the Supreme Court held in Chatrie that pulling historical geofence data is a Fourth Amendment search, which means law enforcement has to get a warrant supported by probable cause and, in theory, drawn narrowly enough to matter.
What the Court did not do is spell out how narrow is narrow enough. A 200-phone return might survive review if the shape and time window were tight and the crime scene was crowded. It might get suppressed if the fence swept in an apartment building, a highway, or a church parking lot for no good reason. That fight now happens case by case, in front of trial judges, on the same record the bystanders showed up in.
The 199 Have Options Most of Them Never Use
A bystander pulled into a geofence return has more room to push back than the situation suggests, but only by acting early. Groups like the ACLU and the criminal defense bar have been building the playbook for years, and the moves are not complicated.
Do not volunteer a statement. A federal agent at the door is not looking for context. Politely decline to answer questions and get counsel involved before anything is on the record.
Preserve your own timeline. Screenshots of calendar entries, transit receipts, and messages that place you elsewhere are worth more the sooner you save them. Location history on your own device can help or hurt; do not delete it.
Ask what warrant produced the contact. If the answer is a geofence or reverse keyword warrant, the affidavit and return are the documents your lawyer will want. The scope of the fence is often the whole case.
The Warrant May Be Rarer, but the Data Pipeline Is Not
Google’s 2023 shift to storing location history on the device instead of central servers cut down the pool that a geofence warrant can reach, and post-Chatrie, agencies are more cautious about asking for one at all. That’s progress. It’s not the end of reverse location searches, because the same investigative instinct pushes toward advertising data, other apps, and reverse keyword requests that run the same play from the other direction.
The 200-phone return may become a smaller return. The number is still not zero, and the odds that a person in a normal week ends up on one of these lists are higher than most people realize. Knowing what the list is, and what it is not, is the difference between a nervous afternoon and an unnecessary charge.