Unmarried Partner Infidelity Investigations in South Dakota

01Why it matters

Why Unmarried Couples in South Dakota Seek an Investigator

Married people have a divorce court to sort out property and support. Unmarried partners usually do not, and that gap is why many of them want facts early. A couple may share a lease in Sioux Falls, a pickup bought on one person's credit, a business started together or a child. When one partner starts disappearing on weekends, the other is left guessing about the relationship and the money. Our South Dakota surveillance services answer the first question, and records work answers the second.

The questions are practical. Is the partner seeing someone else, and is that person living in the home part of the week? Is shared money paying for it? Does the new companion have a history that matters around your child? Each one calls for a different mix of observation and research, and we scope only what your situation needs. If you are not ready to hire anyone, the guide to what investigators may do shows the boundaries we work within.

02Co-parenting

Unmarried Parents and Custody Under SDCL 25-4-45

Parents who never married stand on equal footing in a South Dakota custody case. SDCL 25-4-45 directs the court to the child's best interests in respect to temporal, mental and moral welfare and states that neither parent may be given preference over the other. A new relationship is not misconduct by itself. It becomes relevant when it affects the child, such as an unsafe companion staying overnight or a parent leaving young children alone to spend time elsewhere. Our custody investigations guide covers how courts weigh that evidence.

We plan these cases around the parenting schedule. Coverage is placed on the nights the other parent has the children, and observations stay limited to who is present, how long and whether supervision appears adequate. When a new partner's background is the worry, a $300 deep-dive check can surface protection orders or relevant convictions, and our witness vetting service can review anyone expected to testify. Custody orders can be modified at any time under the statute, so documented changes in circumstances can matter years after the first order.

03Money and property

When a Breakup Involves Shared Money, Vehicles or a Business

Unmarried partners who split up generally resolve property through contract and civil claims rather than divorce. South Dakota allows six years for contract and fraud claims under SDCL 15-2-13, and small claims court hears disputes up to $12,000 under SDCL 15-39-45.1. That makes documentation valuable: who paid for what, whose name is on the title and whether a partner moved money or equipment before leaving. Our stolen asset recovery team traces property that disappeared, and our asset investigation service builds the broader financial picture.

Vehicles come up constantly. A partner who drives off in a truck titled to you may be committing unauthorized use under SDCL 22-30A-12, while a permanent taking can be theft graded by value. We do not repossess anything or confront anyone, but we can document where the vehicle is and who is using it so your attorney or law enforcement can act. Equipment taken from a shared shop or ranch falls to our stolen equipment investigators, who know how farm and contractor gear moves across county lines.

04Before the wedding

Vetting a Fiance or Long-Term Partner Before You Commit

Some clients come to us before anything has gone wrong. An engagement, a move in together or a plan to buy a house is a reasonable time to confirm what you have been told. We check identity, prior marriages and divorces where court records are public, civil judgments, bankruptcy filings and criminal history, and we report what the records show without editorializing. A basic remote background check costs $102 and the deep-dive version $300. Our dating background check page lists exactly what each tier covers.

When the partner lives far away, surveillance may be needed to confirm that the life they describe exists. A partner working rotations out of state, deployed with a unit or living several hours away may be honest, or may have a second household. We coordinate coverage at the other end through our multi-state surveillance coordinators. Online-only relationships deserve extra caution, because romance schemes increasingly end in cryptocurrency requests, and our crypto scam investigators look at those patterns specifically.

05Local angle

College Towns, Ellsworth AFB and Relationships That Move Around

Many unmarried couples in South Dakota meet through its universities or the military. South Dakota State University in Brookings, the University of South Dakota in Vermillion, Black Hills State in Spearfish and Northern State in Aberdeen all bring young adults into small cities for a few years, and relationships often stretch across semesters and hometowns. Our Brookings private investigators and the Vermillion investigative team understand how campus schedules shape where people go and when.

Ellsworth Air Force Base, near Rapid City and Box Elder, is the planned first main operating base for the B-21 Raider and is expected to add about 1,600 Airmen. Military relationships involve deployments, temporary duty and frequent moves, which can make a partner's absences hard to read. We do not access military records or contact commands. We document off-base conduct lawfully, and our Box Elder investigators work the communities around the base where many service members live.

06Legal limits

Stalking, Recording and Trespass Limits That Protect Everyone

An unmarried partner has the same privacy protections as a spouse, and sometimes clients forget that once a relationship sours. Repeatedly following or harassing someone, including through electronic messages, can be stalking under SDCL 22-19A-1, a Class 1 misdemeanor for a first offense. Recording conversations you are not part of can violate SDCL 23A-35A-20. Peeking into a window on another person's property can violate SDCL 22-21-3. Our recording law explainer is a good starting point before you do anything on your own.

Our investigators observe from public places, never enter property after notice and never contact the subject. If your former partner is the one following or threatening you, the situation changes. A petition for a protection order under SDCL 22-19A-8 must be supported by a sworn affidavit of specific facts, and our stalking investigation team documents the pattern with dates, times and photographs. Threatening or harassing texts may also fall under SDCL 49-31-31, which our cyberbullying investigators review alongside the stalking statute.

07Price

What Unmarried Partner Infidelity Investigations Cost

Field surveillance runs $100 per hour, and most unmarried partner infidelity investigations need only a few well-placed shifts on the nights or weekends that do not add up. Travel and mileage are disclosed before work starts, and nothing is billed beyond the written scope without your approval. The South Dakota price list shows every rate, including the $102 and $300 background tiers that often accompany a surveillance file.

If the case turns into a lawsuit over property or a custody petition, an attorney can retain us for civil litigation support with a $1,000 minimum, and Delator Field Services can coordinate service of the papers with logged attempts and a signed affidavit. Our South Dakota legal paper service guide explains how service works under SDCL 15-6-4. The investigator cost guide shows how a realistic estimate is built before you commit.

Services

Unmarried Partner Investigation Services in South Dakota

• Partner activity surveillanceObservation during unexplained evenings, weekends or trips, documented with times, locations, vehicles and companions from public vantage points only and nothing more.Learn more
• Fiance and partner vettingBackground research on identity, prior marriages, judgments and criminal history, available as a $102 basic check or $300 deep-dive history.Learn more
• Co-parenting documentationCoverage during the other parent's scheduled time, limited to who is around the child and whether supervision appears adequate overnight.Learn more
• Shared asset tracingRecords work that follows money, vehicles or property a partner may have moved or hidden before or after a breakup.Learn more
• Taken vehicle locatesLawful documentation of where a truck or car titled to you is parked and who is driving it, prepared for counsel or police.Learn more
• Hotel meeting coverageArrival and departure documentation at motels and hotels across the state, without entering or looking into any guest room at any point.Learn more
• Long-distance verificationCoordinated coverage in another city or state to confirm whether a partner's described life, job and living situation are real.Learn more
• Harassment documentationEvidence of repeated following, threats or harassing messages from a former partner, organized to support a protection order petition with dates.Learn more
• Romance scam reviewInvestigation of an online partner who may not be who they claim, including requests for money, gift cards or cryptocurrency.Learn more

How it works

How an Unmarried Partner Investigation Works

1. 01

   Confidential call

   You explain the relationship, living arrangements, any children or shared property and what has changed. We tell you plainly whether an investigation is likely to help.

2. 02

   Scope in writing

   We match the work to your question, whether that is surveillance, records research or both, and confirm the hours, travel and price before anything starts.

3. 03

   Lawful fieldwork

   Investigators observe from public places and research public records, logging each observation with a time stamp and keeping you updated during active coverage so you can adjust the plan.

4. 04

   Clear findings

   You receive a written report with photographs and records, including what we could not confirm, so you or your attorney can decide what comes next.

Compare

Typical Unmarried Partner Assignments in South Dakota

Statewide coverage

Relationship Investigations Throughout South Dakota

We accept unmarried partner cases statewide. Southeast suburbs are covered by our Brandon investigators and the Tea private investigator team, and Lake County matters by our Madison investigators. In the northern Black Hills, our Spearfish surveillance team covers Lawrence County, including Lead and Deadwood. Wherever the case begins, the same legal limits, written scope and reporting format apply, and long rural drives are planned as separate field days with travel disclosed first. Reports read the same whether they come from Sioux Falls or the Black Hills.

• Sioux Falls
• Rapid City
• Brookings
• Vermillion
• Box Elder
• Spearfish
• All of South Dakota

FAQ

Frequently asked questions

Every service

Investigations available in South Dakota

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

Service areas

Private investigators across South Dakota