Cars parked outside a red brick commercial building, the kind of street scene a private investigator in Sioux Falls documents

Minnehaha and Lincoln counties, South Dakota

Private Investigator in Sioux Falls, SD for Attorneys, Families and Employers

Delator Group assigns vetted investigators across Sioux Falls, Brandon, Harrisburg, Tea and the rest of the metro for surveillance, witness work, locates and fraud inquiries. Field time is billed at $100 per hour under a scope you approve in writing first, and every finding is delivered in a report organized for circuit and federal court.

  • Written scope and price before work
  • Minnehaha and Lincoln county coverage
  • Reports organized for court use
Request a confidential consultation Call (629) 310-8667
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  • 75+Designated investigative specialties
  • $100/hrStandard field investigation rate
  • WrittenScope and price approved first
  • 5.0Google rating (18 reviews)

Quick answer

How much does a private investigator in Sioux Falls cost?

Field assignments in Sioux Falls are billed at $100 per hour, and you approve the hours in writing before anyone is assigned. Case matters carry set minimums, for example $1,000 for civil litigation support or an asset investigation. Remote work costs less, starting at $102 for a basic background check. The full South Dakota rate schedule lists every tier.

01Local knowledge

Why Sioux Falls Cases Need an Investigator Who Knows the Metro

Sioux Falls had an estimated 213,748 residents in 2025, and the city does not stop at one county line. Most of it lies in Minnehaha County, but the growing south side reaches into Lincoln County, which grew more than 18 percent between 2020 and 2025. A subject can live in Harrisburg, work downtown and spend evenings in Brandon, so our surveillance investigations in South Dakota are planned around the actual commute rather than a single address.

Traffic patterns matter as much as geography. Interstate 29 and Interstate 90 meet at Sioux Falls, and I-229 loops around the south and east sides of the city, which gives a cautious subject several fast ways to change direction. We plan vehicle positions, alternate routes and handoff points before a shift begins, and when a subject drives out of the region we can extend coverage through multi-location and out-of-state surveillance under the same written scope.

  • I-29, I-90 and the I-229 loop all converge here
  • City limits extend into both Minnehaha and Lincoln counties
  • Brandon, Harrisburg, Tea and Hartford within a short drive

02Infidelity, family and custody

Infidelity, Divorce and Custody Investigations in Sioux Falls

South Dakota still lists adultery among the grounds for divorce in SDCL 25-4-2, next to irreconcilable differences and several other fault grounds. Whether proof of an affair helps your case is a question for your lawyer, but it can bear on grounds, on arguments over a suitable allowance under SDCL 25-4-41, or on parenting. Our spousal infidelity investigations supply dated observations your attorney can weigh, and concerns about a partner you are not married to go through relationship investigations for unmarried couples.

In custody disputes, a South Dakota judge decides based on the child's temporal, mental and moral welfare under SDCL 25-4-45, and neither parent gets automatic preference. Courts may also look at the Fuerstenberg factors, such as stability, primary caretaking and harmful parental misconduct. We document what actually happens at exchanges and during parenting time without approaching the child. If you suspect money is being moved during the divorce, read our guide to finding hidden assets in a South Dakota divorce before your next meeting with counsel.

03Attorney and litigation support

Litigation Support at the Minnehaha County Courthouse and Federal Court

The Second Judicial Circuit, which covers only Minnehaha and Lincoln counties, holds court at the Minnehaha County Courthouse, 425 North Dakota Avenue. Circuit judges there hear civil and criminal cases of every size, while magistrate judges handle small claims and other civil claims of $12,000 or less, misdemeanors and many protection-order petitions. Residents of the Lincoln County side of the city may land in the courthouse at 104 North Main Street in Canton instead. Our litigation support for South Dakota attorneys covers witness location, statements, records and trial preparation in either building.

Federal cases filed in the District of South Dakota are often heard at the federal courthouse at 400 South Phillips Avenue, and appeals go to the Eighth Circuit. Before depositions or cross-examination, counsel can order background research on witnesses to check prior statements, judgments and affiliations. Criminal defense lawyers use our defense investigations in South Dakota, which start at $750 for a misdemeanor and $1,000 for a single felony, to re-interview witnesses and test the State's timeline.

04Business, insurance and the local economy

Health Care, Banking and Employer Investigations in Sioux Falls

Health care dominates local payrolls. Sanford Health and Good Samaritan together employ roughly 11,000 to 11,500 people in Sioux Falls and Avera Health another 9,500 to 10,000, according to the Sioux Falls Development Foundation, with Smithfield Foods, Amazon and Hy-Vee also among the largest employers. Large workforces bring payroll padding, inventory loss and misconduct complaints, and our corporate investigation services start with the specific loss management can describe. When the issue is internal, workplace theft inquiries focus on records, access and interviews.

Injury claims are the other recurring employer matter. Under SDCL 62-4-51, knowingly submitting a false workers' compensation claim is a Class 1 misdemeanor, and larger schemes may also fall under the insurance fraud chapter. Our workers' comp activity checks are gathered from public places and reported accurately, including observations that support the claimant. Insurers handling liability or disability files can request claim surveillance for insurers on the same terms.

05Locates, skip tracing and service

Locating People and Coordinating Service Around Sioux Falls

A fast-growing metro produces a lot of moves. New subdivisions in Harrisburg, Tea and Brandon, short apartment leases near downtown and commuters who cross into Minnesota or Iowa all make database results go stale quickly. Every locate we run pairs records research with a field check of the address before we report it. Our people-location services cover witnesses, heirs and former tenants, and lenders and landlords can request collection-focused debtor tracing for judgment work.

Once the person is confirmed, Delator Field Services can coordinate service in Minnehaha County with logged, time-stamped attempts and a signed affidavit of service. Routine service in the county carries a published starting rate of $125, and the final price is confirmed in writing before the first attempt. Service details for the city are on our Sioux Falls process server page, and families searching for an adult relative can begin with a missing person locate.

Weathered barn on open farmland, typical of the rural edges of Minnehaha and Lincoln counties
Photo: Alex Kotomanov / Unsplash

06South Dakota legal limits

South Dakota Has No PI License: How to Vet a Sioux Falls Investigator

South Dakota does not license private investigators. Bills to create a license were introduced in 1995 and again in 2013, and neither passed. That means anyone can print business cards, so the screening falls to you. Ask for proof of insurance, a written scope with hours and price, a redacted sample report and the name of the person who supervises the file. Our checklist for vetting a South Dakota investigator explains why each item matters. Delator Group is a licensed Tennessee firm and applies that standard to every South Dakota file.

State criminal law still draws firm lines. Under SDCL 23A-35A-20, recording a conversation is generally lawful only with the consent of a participant, and SDCL 22-21-1 makes it a crime to install a recording or observation device in a private place without consent. Stalking under SDCL 22-19A-1 includes repeated harassment by electronic or digital means. We do not place trackers on vehicles a client has no right to. Before you record anyone yourself, read South Dakota's rules on recording conversations.

  • Certificate of liability insurance
  • Written scope listing hours, travel and price
  • Redacted sample report
  • Named supervisor responsible for the file

07The financial-services angle

Card Banking, Trust Assets and Fraud Inquiries in Sioux Falls

Sioux Falls became a card-banking center after South Dakota removed its interest-rate cap and Citibank became a South Dakota-chartered bank in February 1981. Citi, Wells Fargo and First PREMIER each still employ roughly 1,000 to 1,500 people in the city. That concentration means a steady flow of account-takeover, identity misuse and internal fraud questions. Under SDCL 22-40-8, using another person's identifying information to deceive or defraud is a Class 6 felony. Our fraud and scam investigations reconstruct the trail for counsel and, where appropriate, law enforcement.

South Dakota is also a major trust jurisdiction, with no rule against perpetuities and trust assets reported at about $815 billion in 2024. Those structures can complicate asset tracing in divorce and collection cases. We work from public records and lawful discovery only, and never imply that sealed trust records are reachable. Our South Dakota asset searches start at a $1,000 minimum, and companies vetting a partner or acquisition target can order due diligence on mergers and acquisitions.

Scams aimed at older residents follow the same money. South Dakota's 2026 crypto kiosk law, reported to have taken effect in July 2026, generally caps kiosk transactions at $1,000 a day for each user and requires refunds of fraud-induced transactions within 72 hours once its conditions are met, and Sioux Falls police have reported kiosk losses in the tens of thousands of dollars. If a parent has been pushed into wiring funds or feeding a kiosk, our elder scam investigations document what happened and who is behind it.

Pair of black binoculars used for lawful observation during surveillance and fraud inquiries
Photo: George Dumitrache / Unsplash

Services

Investigative Services in Sioux Falls and the Surrounding Metro

Every service

Investigations available in Sioux Falls

Every service below is available in Sioux Falls 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.

Core services

Infidelity

Surveillance

Background checks

Privacy

Corporate

Criminal defense

Employment

Audits

Locates

Sensitive matters

Theft

Abuse

Vehicles

Scams

How it works

How a Sioux Falls Investigation Moves From First Call to Final Report

  1. 01

    Confidential consultation

    You explain what is going on to a member of Delator leadership over the phone or by video. We say plainly whether an investigation can answer your question and what information we would need from you.

  2. 02

    Written scope and fee

    Goals, hours, travel and cost are set out in writing for your approval before an investigator is assigned. Field time runs $100 per hour and stays within the approved limit.

  3. 03

    Field work across the metro

    The assigned investigator works the file in Sioux Falls and wherever the subject travels, logging each observation and reporting to you in writing at agreed checkpoints.

  4. 04

    Report built for counsel

    You receive a written report with dated photographs, a timeline and source notes, organized so your attorney can use it in magistrate, circuit or federal court.

Compare

Common Sioux Falls Matters and How They Are Priced

MatterTypical approachPricing basis
Suspected affairTargeted surveillance on key days$100 per hour, approved in writing
Misdemeanor defenseWitness interviews and scene reviewFrom $750
Civil litigation supportRecords, witnesses and trial preparation$1,000 minimum
Scam investigationPayment trail and identity researchFrom $2,000
Deep-dive background checkRemote multi-source research$300

Local coverage

Sioux Falls Neighborhoods and Nearby Communities We Cover

  • Downtown Sioux Falls
  • Cathedral Historic District
  • Pettigrew Heights
  • All Saints
  • McKennan Park
  • Falls Park area
  • Brandon
  • Harrisburg
  • Tea
  • Hartford
  • Dell Rapids
  • Crooks
  • Baltic
  • Lennox
  • Valley Springs
  • Canton

Nearby

Investigators Near Sioux Falls

Many Sioux Falls files continue just outside the city. East-side matters often overlap with our investigator page for Brandon, and the fast-growing south side connects to Harrisburg investigations and Lincoln County. Subjects who head north on I-29 lead us toward investigators serving Brookings, while cases moving west on I-90 reach the Mitchell and Davison County team. One leadership team supervises every South Dakota file, so a case that crosses county lines keeps a single contact and a single written scope.

Delator Field Services

Process serving in Sioux Falls

Need papers served in Sioux Falls or elsewhere in Minnehaha County? Delator Field Services coordinates service with logged attempts and a signed affidavit, and our investigators can locate an evasive party first.

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FAQ

Frequently asked questions

Does a private investigator in Sioux Falls need a South Dakota license?

No. South Dakota has never adopted a statewide private investigator license; licensing bills failed in 1995 and 2013. Because the state screens no one, ask any firm for insurance, a written scope, a sample report and a named supervisor, and confirm any local business requirements. Delator Group is a licensed Tennessee firm and holds its South Dakota work to that standard. Our guide to choosing an investigator in a no-license state covers the details.

Which courts do you work in around Sioux Falls?

We support counsel in the Second Judicial Circuit at the Minnehaha County Courthouse on North Dakota Avenue, in the Lincoln County courthouse in Canton for south-side matters, in magistrate court for smaller civil claims and misdemeanors, and in the federal courthouse on South Phillips Avenue. Attorneys can see how we support trial teams on our page for law firms.

Is it legal to record my spouse's calls in Sioux Falls?

Generally, South Dakota allows a participant in a conversation to record it, but recording a conversation you are not part of without a party's consent can be a felony under SDCL 23A-35A-20. Hidden devices in private places raise separate problems under SDCL 22-21-1. Speak with your attorney first. Our overview of what investigators may lawfully do in South Dakota explains the limits we work within.

Is it legal to put a GPS tracker on a car in South Dakota?

South Dakota has no statute aimed specifically at private GPS trackers, but that does not make them safe. Covertly tracking another person can support stalking, harassment or trespass claims depending on the facts. We document movement through lawful surveillance and do not place devices on vehicles a client has no right to. If you think you are the one being tracked, our stalking investigations can help.

Do you have an office in Sioux Falls?

No. Delator Group is headquartered in Nashville, Tennessee, and assigns vetted investigators to Sioux Falls and the rest of South Dakota. Consultations take place by phone or video, and the field work happens wherever the facts are, whether that is downtown, in a Lincoln County subdivision or out along I-90. The same leadership supervises every file.

How long does a Sioux Falls infidelity case take?

That depends on how predictable the suspected meetings are. If you can point to particular evenings, a gym schedule or work travel, a few targeted shifts may answer the question. If the pattern is unknown, we start with a short block of hours and review results with you before adding time. Every extension is approved in writing, so the budget never grows without your consent.

Can you check out a business partner or vendor before we sign?

Yes. We research ownership, litigation, liens, judgments and the people behind the company, then report anything that bears on your decision. A remote due diligence report is $300, and field inquiries are billed hourly. For a partner you will share control with, our business partner screening goes deeper into history and reputation.

What does process service cost in Minnehaha County?

Minnehaha County's published Routine starting rate is $125. Faster tiers scale from that figure, with Urgent at 1.5 times, Rush at twice and Same Day Rush at three times Routine. We confirm the final price for a Minnehaha County serve in writing before the first attempt. The South Dakota county rate map shows starting rates for all 66 counties.

Can you help if someone stole my identity or emptied an account?

Yes. Report the theft to law enforcement and your bank first, because an investigator supplements that work rather than replacing it. We then trace how the information was obtained, where funds or goods went and who benefited, and organize the findings so your lawyer can pursue civil remedies or support a criminal referral. Identity theft is a Class 6 felony under SDCL 22-40-8.

What should I prepare before the first call?

Write down names, approximate dates of birth, addresses, vehicles, employers and any court dates, along with what you have personally seen and when. Gather photographs if you have them. Do not confront the person or search their phone, which can create legal exposure and alert them. The clearer the starting facts, the fewer billable hours the case needs.

Service areas

Private investigators across South Dakota

Delator Group is headquartered in Nashville, Tennessee. Work in South Dakota is managed by Delator Group leadership; Photography: Simon Ray / Unsplash · Alex Kotomanov / Unsplash · George Dumitrache / Unsplash. Last reviewed .

Delator Group Private Investigators seal

Delator Group Private Investigators

Talk Through Your Sioux Falls Matter With Delator Leadership

Tell us what is happening in Sioux Falls or anywhere in Minnehaha and Lincoln counties. We will lay out what an investigation can establish, how long it should take and what it will cost, in writing, before work starts.

Request a consultation (629) 310-8667Submit a Serve

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