“Trap and trace” sounds like a hidden wire from an old detective story, but Minnesota law treats it as a narrow legal tool. It is usually not about hearing a call or reading a message. It is about the trail around a communication. A pen register looks at what goes out. A trap-and-trace device looks at what comes in. The words stay locked inside the room, but the footprints near the door can still say plenty.
Minnesota has its own state rules for pen registers, trap-and-trace devices, and mobile tracking devices in Chapter 626A of the Minnesota Statutes. These rules are more detailed than a simple nod to federal law. They say when a court order is required, who can apply, what the application must contain, what the order must say, how long the order can run, when secrecy applies, when notice must be served, and when providers or other people must help with setup.
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What a Pen Register Does
A pen register records or decodes outgoing communication signals. Minnesota defines it as a device that records or decodes electronic or other impulses that identify the number dialed or otherwise transmitted on the telephone line where the device is attached.
In plain English, a pen register asks: who did this line reach out to? It can show outside destination data. It does not, by itself, let anyone hear the call, read the text, or see the body of an email.
Think of a pen register as someone watching outgoing envelopes at a mailroom table. They can see addresses and dates. They cannot open the envelopes and read the letters. Still, a stack of envelopes can show patterns, habits, and relationships.
What a Trap-and-Trace Device Does
A trap-and-trace device works in the opposite direction. Minnesota defines it as a device that captures incoming electronic or other impulses that identify the originating number of an instrument or device from which a wire or electronic communication was transmitted.
In plain English, it asks: who reached in? It helps identify the origin of incoming communications. Like a pen register, it is aimed at identifying details, not message content.
Picture a cabin after new snow. A pen register watches tracks leaving the cabin. A trap-and-trace device watches tracks coming toward it. Neither one opens the door and listens to the people inside.
Where Minnesota Puts These Rules
Minnesota places these rules in Chapter 626A, under the part dealing with pen registers, trap-and-trace devices, and mobile tracking devices. The main sections are 626A.35 through 626A.39, with related civil remedies in 626A.391 and location rules in 626A.42.
Section 626A.35 gives the main ban and exceptions. Section 626A.36 covers applications. Section 626A.37 covers court orders. Section 626A.38 covers provider and other helper duties. Section 626A.381 covers notice and inventory. Section 626A.39 defines the key terms.
This makes Minnesota different from states that mostly point to federal pen-register law. Minnesota has a state path with its own steps. Federal law can still matter, but Minnesota gives its courts and officers a local road to follow.
The General Ban in Section 626A.35
Except for listed exceptions, Minnesota says no person may install or use a pen register, trap-and-trace device, or mobile tracking device without first obtaining a court order under Section 626A.37.
That wording reaches beyond police. It says no person. A private person cannot secretly set up a call trace, account trace, or movement tracker just because the information would be useful. Suspicion, anger, romance trouble, family conflict, or workplace curiosity is not a court order.
A knowing violation can bring a fine of up to $3,000, imprisonment up to 364 days, or both. That penalty gives the statute teeth. Secret tracing is not treated as a harmless game.
Provider Exceptions
Minnesota allows providers of electronic or wire communication service to use a pen register or trap-and-trace device in limited service-related settings. A provider may use the tool for operation, maintenance, and testing of a wire or electronic communication service.
A provider may also use it to protect its rights or property, or to protect users from abuse of service or unlawful use of service. The statute also allows use to record the fact that a communication was started or completed when that helps protect the provider, another provider helping complete the communication, or a user from fraud, unlawful use, or abuse. User consent can also fit an exception.
These exceptions are built for service health, fraud control, abuse response, and user protection. They are not a license for private snooping. A provider fighting fraud is one thing. A private person tracing another person’s calls from a home laptop is another.
Mobile Tracking Devices Are Included
Minnesota’s Chapter 626A rules also include mobile tracking devices. A mobile tracking device is an electronic or mechanical device that permits tracking the movement of a person or object.
This matters because Minnesota places movement trackers near pen-register and trap-and-trace tools in the same part of the chapter. The state treats them as related court-order tools, even though tracking movement is not the same thing as tracing incoming or outgoing communication data.
Minnesota also has newer exceptions for certain stolen vehicles and fleeing vehicles. Those exceptions carry tight time limits, reports, removal duties, and search-warrant follow-up rules. A tracker on a vehicle can raise issues that are separate from a phone-number trace.
Who Can Apply for an Order?
An investigative or law enforcement officer with responsibility for an ongoing criminal investigation may apply for an order or an extension. The application must be in writing, under oath or an equivalent affirmation, and made to a district court.
The application must identify the officer making the request, any other officer or employee authorizing or directing it, and the law enforcement agency conducting the investigation. It must also include the facts and circumstances relied upon by the applicant to justify the belief that an order should be issued.
This is not a casual request. The officer must bring the matter to court, put the request in sworn form, and describe the facts behind the request. The court acts as the gate.
The Court’s Standard
The court may enter an ex parte order if it finds, based on the information submitted, that there is reason to believe the information likely to be obtained is relevant to an ongoing criminal investigation.
“Ex parte” means the target or subscriber is not present for the request. This is common for investigative orders because advance notice could tip off the person being investigated.
The standard is not the same as a full content-search warrant. The order is meant to reach non-message data, or tracking data in the mobile tracking device setting. Still, the court must find the statutory reason to believe standard from the submitted facts.
What the Order Must Say
A Minnesota order must identify, if known, the person to whom the telephone line is leased or in whose name it is listed. For a mobile tracking device, it must identify the person to be traced if known. The order must also identify, if known, the person who is the subject of the criminal investigation.
The order must state the number and, if known, physical location of the telephone line for a pen register or trap-and-trace device. For a mobile tracking device, it must identify the nature of the object or objects to which the device will be attached. For a trap-and-trace order, it must also give geographic limits.
The order must state the offense tied to the information likely to be obtained. It must name the officer responsible for installation and use. It must also state the period during which use is authorized.
How Long the Order Can Last
A Minnesota order may authorize installation and use for no more than 60 days, or for the period needed to achieve the objective, whichever is shorter. Extensions can be granted, but only through another application and the required court finding.
An extension also may not exceed 60 days, or the period needed to achieve the objective, whichever is shorter. The extension must include any changes in the information required for the order.
The dates matter. The start date, end date, and extension papers form the fence around the order. In a criminal case, a lawyer may compare the order dates with provider records and officer reports.
Sealing and Nondisclosure
A Minnesota order for a pen register, trap-and-trace device, or mobile tracking device must direct that the order be sealed until the court orders otherwise. It must also direct the person who owns or leases the line, or who has been ordered to help, not to disclose the device or the investigation to the listed subscriber or anyone else unless the court permits it.
This is why a person may not learn about the order while it is active. A phone company, internet provider, landlord, custodian, or other helper may be under a court command to stay silent.
Orders involving electronic device location information are handled under a separate filing, sealing, and reporting rule in Section 626A.42. That distinction matters because location information has its own warrant process.
Provider, Landlord, and Custodian Help
Section 626A.38 requires help when the court order directs it. For a pen register or mobile tracking device, a provider of wire or electronic communication service, landlord, custodian, or other person must furnish information, facilities, and technical help needed to accomplish the installation in an unobtrusive way with minimal service interference.
For a trap-and-trace device, the provider or other ordered person must install the device immediately on the proper line and furnish added information, facilities, and technical help, including installation and operation. Unless the court says otherwise, results must be given to the officer designated by the court at reasonable intervals during regular business hours.
The helper must be reasonably paid for reasonable expenses. Minnesota also blocks lawsuits against providers and their people for providing information, facilities, or help according to a court order under these sections.
Notice and Inventory
Minnesota has a notice rule that many people miss. Within a reasonable time, not later than 90 days after an application is denied or after the termination of an order, the issuing or denying judge must serve an inventory on the people named in the order or application.
The inventory must tell them the fact of the order or application, the date of the order or denial, the period of authorized, approved, or disapproved activity, and whether activity did or did not occur during that period.
A judge may postpone or dispense with the inventory on an ex parte showing of good cause. The judge may also allow a person or the person’s lawyer to inspect portions of the results, application, or order when the judge finds that doing so fits justice.
Civil Claims and Damages
Minnesota allows a person harmed by a violation of Sections 626A.35 through 626A.39 to bring a civil action against the violator. The person may seek damages and other relief, including temporary, equitable, or declaratory relief, plus reasonable costs and attorney fees.
The action must begin within two years after the violation occurs or within two years after the claimant first had a reasonable chance to discover it.
The statute also gives defenses. Good faith reliance on a court warrant or order, grand jury subpoena, or statutory authorization can be a complete defense. Good faith reliance on certain law enforcement requests under federal wiretap law can also serve as a complete defense.
Electronic Device Location Information
Minnesota has a separate section for location information of electronic devices and unique identifiers. Under Section 626A.42, a government entity generally may not obtain location information without a tracking warrant.
A tracking warrant requires probable cause that the person possessing the device or using the unique identifier is committing, has committed, or is about to commit a crime. The application must be in writing and must include the officer identities and a full statement of facts and circumstances.
There are exceptions for lost or stolen devices, emergency service responses, documented consent, certain missing or deceased person situations, and emergencies involving risk of death or serious physical harm. Location data is not the same as ordinary trap-and-trace data, and Minnesota treats it with a stronger warrant rule.
How This Differs From Wiretapping
Wiretapping or interception reaches content. Minnesota defines “intercept” as acquiring the contents of a wire, electronic, or oral communication through a device. “Contents” means information about the substance, meaning, or message of the communication.
A pen register or trap-and-trace device is narrower. It is aimed at numbers and signaling details around a communication, not the substance of the call or message. A mobile tracking device tracks movement. Each tool has its own place.
Still, non-content data can be powerful. A contact pattern can show who calls whom, when, and how often. Movement data can show where a person or object travels. The envelope is not the letter, but it can still show a route.
Federal Law Still Matters
Federal law also governs pen registers and trap-and-trace devices through 18 U.S.C. Sections 3121 through 3127. Federal rules can matter when federal officers are involved, when a federal court order is used, or when providers operate across state lines.
Minnesota’s own statute also says nothing in Chapter 626A authorizes conduct that violates federal law. That means state authority does not erase federal limits.
In a real case, a lawyer may read the Minnesota order and the federal statute together. The state order may be valid under state procedure, but federal law can still shape what was allowed.
Private People Should Not Try This
Do not install hardware, software, hidden apps, router settings, call-forwarding rules, account filters, or tracking devices to trace another person’s communications or movements without clear lawful authority. Suspicion is not enough. A breakup is not enough. Owning the phone bill may not be enough.
Do not log into another person’s account to see who contacts them. Do not hire someone to trace calls, messages, or location outside legal process. Do not put a tracker on a car, bag, phone, or work device for personal reasons.
Minnesota starts with a no-person-may-install-or-use rule. Private misuse can bring criminal penalties, civil claims, family-court trouble, workplace discipline, and federal law issues.
Employers and Business Systems
Employers often keep phone logs, access logs, network logs, security alerts, and device-management records. Some of that can be normal business activity when tied to service upkeep, security, billing, fraud control, or user protection.
But secret tracing of private communications or movement can create legal risk. Company ownership of a phone, laptop, router, or vehicle does not answer every question. Written policy, user notice, consent, business need, data type, and access limits all matter.
A Minnesota employer should get legal review before adding tools that trace worker communication patterns or movement beyond routine business records. The safer path is clear policy, narrow collection, and careful record handling.
What Minnesota Residents Should Know
For Minnesota residents, the practical point is that officers with responsibility for an ongoing criminal investigation may seek a district court order for a pen register, trap-and-trace device, or mobile tracking device. The person tied to the line, object, or investigation may not learn about it while the order is active because sealing and nondisclosure rules apply.
The data may later appear in court papers, discovery, warrants, motions, or trial disputes. It may show incoming origins, outgoing destinations, timing, contact patterns, or movement. Even without message content, that data can carry force.
If you learn that one of these orders was used in a case involving you, a Minnesota criminal defense lawyer can review the application, order, dates, provider returns, inventory notice, sealing history, and any extensions.
What Businesses Should Do With an Order
A business, provider, landlord, custodian, or other person who receives a Minnesota order should treat it as legal process. Preserve it. Limit internal access. Send it to counsel or a trained legal response team.
Read the order closely. Check the court, date, covered line or object, time period, named officer, requested help, sealing command, and nondisclosure language. Provide what the order requires, not extra data from extra accounts or extra dates.
Keep a clean record of the response. Note when the order arrived, who reviewed it, what help was given, what data was furnished, and when. A careful response is like tying off a boat before the weather shifts. It keeps the matter from drifting.
Common Misunderstandings
One misunderstanding is that trap and trace means listening to calls. It does not. It points to incoming identifying details, not the words spoken.
Another misunderstanding is that pen-register data has no privacy value. It can show habits, contacts, timing, and repeated ties. A call trail can be a shadow map of a person’s life.
A third misunderstanding is that Minnesota treats location data just like a normal trap-and-trace order. It does not. Electronic device location information has its own tracking-warrant rule in Section 626A.42, with a probable-cause standard unless an exception fits.
A final misunderstanding is that notice never happens. Minnesota has an inventory rule after denial or termination of an order, though a judge may postpone or dispense with service for good cause.
Bottom Line on Minnesota Trap and Trace Law
Minnesota trap and trace law sits mainly in Sections 626A.35 through 626A.39. Except for listed exceptions, no person may install or use a pen register, trap-and-trace device, or mobile tracking device without first getting a court order. A knowing violation can bring a fine of up to $3,000, imprisonment up to 364 days, or both.
An investigative or law enforcement officer with responsibility for an ongoing criminal investigation may apply to a district court in writing under oath or equivalent affirmation. The court may issue an ex parte order if it finds reason to believe the information likely to be obtained is relevant to an ongoing criminal investigation.
The order must identify the line, person, investigation subject, offense, officer, geographic limits when needed, and authorized period. The order may run no more than 60 days, or the period needed to achieve its objective, whichever is shorter. Extensions follow the same path and share the same time cap.
Providers, landlords, custodians, and other ordered people may have to furnish information, facilities, and technical help. Orders are sealed and include nondisclosure language. After denial or termination, Minnesota has an inventory notice rule, subject to delay or waiver for good cause. The law does not read the letter, but it can study the envelope. In Minnesota, that envelope can still carry a long shadow through a criminal case, a business response, or a privacy dispute.