Unmarried Partner Infidelity Investigations in Idaho

01No marriage, real stakes

Why Unmarried Couples in Idaho Hire Investigators

Couples who never married often have as much tied together as spouses do: a lease or mortgage, a shared truck, pets, a business and sometimes children. Idaho law treats them very differently, though. Under Idaho Code § 32-201, a relationship formed after January 1, 1996 is not a marriage unless the couple obtained a license and had a solemnization, so living together as husband and wife does not create a common-law marriage. That means no divorce case and no community property claim when the relationship ends.

Without those protections, facts matter more, not less. If a partner is seeing someone else while you pay the rent, the decision to stay, leave or protect your money is entirely yours, and it should rest on evidence rather than suspicion. Our investigators confirm or rule out the concern through targeted partner surveillance in Idaho, and the answer is often clear within a few shifts. Many clients also ask us to check the other person's background, which our identity and history checks handle for $102 or $300.

02Money and property

Shared Leases, Vehicles and Money When an Unmarried Relationship Ends

When unmarried partners split, property generally follows title, written agreements and what each person can prove they paid. A partner who quietly moves money into a new account, sells a jointly used trailer or takes household items to a new partner's home leaves you with an ordinary civil claim, not a family law case. Our asset location investigators document where funds and property went so your attorney can evaluate the claim.

The forum depends on the amount. The magistrate division hears civil actions up to $10,000 when assigned, and the small claims department handles money claims up to $15,000 under Idaho Code § 1-2301 as amended in 2026, without punitive or pain-and-suffering damages. Timing matters too: an oral agreement generally carries a four-year limitation period under § 5-217, and a fraud claim generally three years from discovery under § 5-218. If the former partner has left town, our Idaho skip tracing team can locate them for service, and our scam investigators step in when the relationship itself was a ruse for money.

03Children

Unmarried Parents, Custody and a New Partner

Unmarried parents face the same custody questions married parents do, usually in the magistrate division of the county where the child lives. Idaho courts decide custody on the child's best interests, and the factors in Idaho Code § 32-717, such as stability, continuity and the child's adjustment to home and school, commonly guide that analysis. Section 32-717B presumes joint custody serves the child unless the evidence shows otherwise. Your attorney can confirm how these rules apply to a parentage case.

A new partner can become relevant when they change the child's routine. If an ex leaves a toddler with someone the court has never heard of, moves a new partner in within weeks or misses exchanges to spend weekends away, documentation of those facts is useful to counsel. We observe lawfully, avoid photographing children wherever possible and report without commentary. Our custody investigation guide for Idaho explains what to gather, and our Nampa family investigators handle many Canyon County parenting cases.

04Engagement vetting

Checking a Partner's Story Before You Move In or Marry

Many unmarried clients come to us before anything has gone wrong. A partner says they were never married, have no children elsewhere and own the business they describe, and something does not quite add up. Public records can confirm or contradict much of that: court filings, prior marriages and divorces, liens, judgments, business registrations and criminal cases. A $102 basic partner background check often settles the question, and a $300 deep-dive adds address history and other states.

Online relationships carry their own risks. A partner met through an app may use a borrowed photograph, a false job or a location they have never lived in, and requests for money are the clearest warning sign. When a new relationship moves quickly toward money or investments, our cryptocurrency fraud investigators review the pattern. If you are the one worried about being found by a former partner, our personal information removal service reduces what is publicly visible for $900.

• Prior marriages, divorces and child support cases
• Other current addresses or households
• Civil judgments, liens and bankruptcies
• Criminal and protection order records
• Business ownership and employment claims

05Local settings

College Towns, a Military Base and Fast-Changing Social Circles

Idaho's college towns produce a steady share of relationship cases. The University of Idaho anchors Moscow on Pacific Time near the Washington line, Idaho State University is in Pocatello, and Brigham Young University–Idaho reported 20,173 on-campus students in Rexburg in Winter Semester 2026. Short leases, roommates and shared vehicles complicate any follow. Our Moscow relationship investigators know the Palouse, and the Rexburg investigative team covers Madison County.

Mountain Home Air Force Base, home of the 366th Fighter Wing, brings a different pattern. Deployments, temporary duty and shift schedules create long absences, and some partners use those gaps to keep a second relationship running. The base itself is a separate jurisdiction, and we never attempt surveillance on it. We work from public places in Mountain Home and along I-84, and our Mountain Home investigators plan coverage around Elmore County's long distances between towns.

06Legal limits

Phones, Messages and Following: Where Idaho Draws the Line

Suspicion can push people toward conduct that becomes the bigger problem. Second-degree stalking under Idaho Code § 18-7906 covers a course of nonconsensual contact, including following a person or maintaining surveillance on them by electronic means, that would cause a reasonable person substantial distress. Logging into a partner's accounts, installing tracking apps or repeatedly showing up where they are can cross that line. Our stalking investigations unit sees the damage from both sides.

Messages carry their own risk. Under § 18-6710, contacting someone by text, email or other electronic means with intent to harass, threaten or intimidate is a misdemeanor on a first offense and a felony on a second. A partner on the receiving end may also petition the magistrate division for a protection order under § 18-7907. Hire someone who works within the law instead. Our guide to online harassment cases and our Idaho recording consent guide explain what evidence you can lawfully keep.

07Price

What Unmarried Partner Infidelity Investigations Cost

Surveillance is billed at $100 per hour, with mileage and travel disclosed before the first shift. Background work is priced separately: $102 for a basic check and $300 for a deep-dive history. Most relationship cases start small, often a background check and one or two evening shifts, because that is usually enough to confirm or dispel the concern. The Idaho investigation price list shows every rate.

Before you hire anyone, ask how they will stay within the law, who will actually do the work and whether the price is in writing. Idaho does not license private investigators at the state level, so those questions are your main protection. Our guide to choosing an investigator in a state without a PI license covers the rest, and Delator confirms every assignment's scope and total in writing first.

Services

Relationship Investigation Services for Unmarried Partners in Idaho

• Partner surveillanceEvening, weekend or travel coverage documenting where a boyfriend, girlfriend or fiance goes and who they meet, using public vantage points only.Learn more
• Fiance background researchRecords research on prior marriages, children, debts, judgments and criminal history before you move in together, sign a lease or marry.Learn more
• Co-parent documentationLawful observation of how parenting time is spent when an unmarried co-parent's new relationship changes the child's routine or supervision.Learn more
• Second household checksConfirmation of whether a partner keeps another residence, vehicle or family in Idaho or a neighboring state, documented with dates and photographs.Learn more
• Property and money tracingResearch into funds, vehicles or household property a former partner took, organized for an attorney evaluating a civil or small claims case.Learn more
• Online identity verificationChecks on whether a partner met through an app is who they claim to be, including name, photographs, employment and actual location.Learn more
• Hotel and travel coverageArrival and departure documentation at Idaho hotels, motels and resort towns when a partner's trip or weekend away raises questions.Learn more
• Former partner locationSkip tracing to find a former partner who left with shared property or money, so papers can be served and a claim can proceed.Learn more
• Privacy protectionRemoval of personal information from data broker sites and public listings for clients worried about a controlling or abusive former partner.Learn more

How it works

How a Relationship Investigation Works in Idaho

1. 01

   Confidential call

   You describe the relationship, what changed and what you already know about schedules, vehicles and places. We explain which lawful steps are most likely to answer your question.

2. 02

   Records first when it helps

   Where the question is about a partner's past or identity, we start with background research, which is faster and costs less than putting investigators in the field.

3. 03

   Targeted field shifts

   If surveillance is needed, investigators cover the specific evenings or trips you identify, staying in public places and reporting after every shift so you control the pace.

4. 04

   Clear written report

   You receive a dated narrative with photographs or records, an honest note of any gaps and, if children or property are involved, a format your attorney can use.

Compare

Common Unmarried Partner Assignments in Idaho

Statewide coverage

Relationship Investigations Across Idaho

We accept unmarried partner cases from every county. North Idaho files near the Washington line are handled by our Post Falls investigators, and Ada County cases by our Boise relationship investigators. Eastern Idaho clients work with our Pocatello private investigators along the I-15 and I-86 corridors. Long drives to small towns are scheduled as separate trips with mileage disclosed in writing, and the report format is identical wherever the work takes place, so an attorney in any county can read it the same way.

• Boise
• Moscow
• Pocatello
• Rexburg
• Mountain Home
• Post Falls
• All of Idaho

FAQ

Frequently asked questions

Every service

Investigations available in Idaho

Every service below is available in Idaho and across Idaho, run by the same Delator Group leadership that manages our Tennessee casework. Choose a service to read how it works in Idaho.

Service areas

Private investigators across Idaho