Find a Licensed Private Investigator in Illinois

01Why people in Illinois hire investigators

When an Illinois matter calls for a licensed private detective

Most requests begin with a question that a person, a business or a lawyer cannot answer from a desk. A DuPage County parent wants to know who is actually caring for a child during parenting time. A Rockford manufacturer suspects that a departed employee took customer lists to a competitor. A Peoria family needs to find a cousin named in an estate. A workers' compensation adjuster in the collar counties doubts that a claimant is as restricted as the medical file suggests. Each of these needs facts gathered lawfully and written up so an attorney or judge can rely on them.

Illinois treats that work as a licensed profession. The Private Detective, Private Alarm, Private Security, Fingerprint Vendor, and Locksmith Act of 2004 makes it unlawful to act as a private detective, or to advertise as one, without a license from the state. So the real first step is not finding the slickest website. It is finding an investigator whose license is active, who has handled your kind of matter, and who knows the courthouse and the neighborhoods where the facts are.

• Family law: allocation of parental responsibilities, dissolution and order of protection matters
• Civil litigation: witness locates, recorded statements and asset research
• Insurance and workers' compensation claim reviews
• Business concerns: employee theft, trade secrets and due diligence
• Personal safety: documenting harassment for counsel or police

02Licensing

How licensing works for a private investigator in Illinois

Illinois regulates private detectives through the Act codified at 225 ILCS 447, administered by the Illinois Department of Financial and Professional Regulation, usually shortened to IDFPR. The license belongs to the person. A licensed private detective who runs a business with employees must also hold a private detective agency license, while a sole practitioner with no employees may operate under a registered assumed name without a separate agency license. People who work for a licensed agency in investigative roles generally carry a Permanent Employee Registration Card, known as a PERC.

Section 10-5 of the Act is broad. It makes it unlawful for a person to act as or provide the functions of a private detective, or to advertise or assume to act as one, or to use any title implying that the person does this work, unless licensed by the Department. Subsection (b) applies the same rule to firms that hold themselves out as a private detective agency. In plain terms, a business that is not licensed in Illinois should not be presenting itself as an Illinois investigator, which is why Delator Group only refers requests and does not offer investigative services in the state.

For a client, the practical rule is to check before you hire. Search the investigator's name and the agency's name on the IDFPR License Look-Up, confirm both are active, and compare the license number with the one on the contract and website. IDFPR's official licensing site also explains how to file a complaint if something goes wrong. Keep a screenshot of the lookup with your file.

03Legal limits

What licensed Illinois investigators can and cannot do

A license lets a person do investigative work for pay. It does not grant police powers. An Illinois private detective cannot arrest anyone, search property, force a person to talk or enter private land without permission. Most of the work happens from public places, through public and court records, licensed data sources and voluntary interviews. Recording is where Illinois differs from many neighbors. Under the eavesdropping statute, 720 ILCS 5/14-2, as rewritten by Public Act 98-1142 in December 2014, it is generally a crime to surreptitiously record a private conversation without the consent of all parties to it.

That rewrite followed Illinois Supreme Court decisions in 2014 that struck down the older, broader version of the law. The current statute focuses on conversations where a party reasonably expects privacy, and it carries narrow exceptions, so whether a specific recording is lawful is a question for an attorney. Electronic tracking is also restricted. Section 21-2.5 of the Criminal Code makes it a Class A misdemeanor to use an electronic tracking device to determine another person's location or movement, with exceptions that include consent of the vehicle's owner or lessee.

The stalking statute, 720 ILCS 5/12-7.3, counts placing a tracking device on a person or their property as a form of surveillance, which is one reason professional surveillance in Illinois is planned, limited to a lawful purpose and carefully logged. Federal law adds its own limits on pretexting for phone and bank records and on access to driver records.

• Generally lawful: observation from public places, public records, voluntary interviews
• Restricted: secretly recording a private conversation without everyone's consent
• Restricted: electronic tracking of a vehicle without the owner's or lessee's consent
• Not allowed: posing as police or using pretexts to obtain bank or phone records

04Regions

Why local knowledge matters across Illinois

Illinois is two very different places for an investigator. Cook County alone holds a large share of the state's people, and the Circuit Court of Cook County is one of the largest unified court systems in the country, with suburban courthouses in Skokie, Rolling Meadows, Maywood, Bridgeview and Markham. The collar counties of DuPage, Lake, Will, Kane and McHenry each have their own courthouse and clerk. Traffic, tollways and dense suburbs shape how surveillance is planned and how long a day of field work really takes.

Downstate, the work changes. Springfield, Peoria, Bloomington-Normal and Champaign-Urbana are regional hubs ringed by farm country, where an unfamiliar car on a gravel road gets noticed quickly. The Metro East counties of Madison and St. Clair are part of the St. Louis area, so many cases involve people and records on both sides of the Mississippi. Rock Island and Moline face the Iowa side of the Quad Cities, and Southern Illinois has small county seats spread across rolling hills and the Shawnee National Forest.

Because Illinois has 25 judicial circuits and many cases touch a neighboring state, requests sent through Delator Group are matched by county. If part of a matter is in Indiana, Wisconsin, Iowa or Missouri, say so early, since each state licenses investigators separately.

05Pricing

How Illinois investigators usually price their work

Each investigator sets their own fees, and the structure usually follows the type of work. Surveillance and field work are most often billed by the hour, frequently with a daily minimum so a short assignment is worth the drive. Mileage or travel time is common when the job is outside the investigator's home area, which can matter in a state that stretches from the Wisconsin line all the way down to the Ohio River at Cairo. Database searches, court record copies and filing fees are usually billed as expenses.

Many Illinois investigators ask for a retainer before starting and bill against it. Some quote a set price for a narrow task, such as a single records search or a defined background report. Ask what the retainer covers, how often you will receive updates, whether report writing and video editing are separate charges, and what happens if the subject stays home on a planned surveillance day. Get the terms in writing before you pay.

06Before the first call

How to prepare for the first conversation with an investigator

A useful first call is short and focused. Write down what you want to learn, why it matters and what you plan to do with the answer. If a case is pending, have the case number, the circuit and county, your attorney's name and any court dates ready. For a person, gather a full name, date of birth if you know it, last known addresses, vehicles, employer, a recent photo and a sense of the person's routine. For a business problem, collect the documents that raised the concern and the names involved.

Expect the investigator to ask whether the goal is lawful and realistic. A licensed Illinois private detective will turn down work that looks like an effort to harass someone or to find a person who has a good reason to stay hidden, and may ask to see court paperwork in custody or order of protection matters. Mention anything that affects safety, such as weapons, past violence or an existing order. When you are ready, send a short request with the county and the goal.

• Your goal in one or two sentences
• County and city where the activity happens
• Names, dates of birth, addresses and vehicles you already know
• Case number, circuit and attorney contact, if any
• Budget range and any hard deadline

Cities

Top 20 cities in Illinois for private investigator requests

These are the 20 most populous Illinois municipalities in recent Census Bureau estimates, including a few large villages and the Town of Cicero, with the county that holds most of each. Several cross county lines, so the exact address can decide which courthouse and records office matter. Include the street address or ZIP code when you send a request.

Counties

Top 20 Illinois counties for investigator requests

Illinois has 102 counties, each with its own circuit clerk, recorder and sheriff, grouped into 25 judicial circuits. The 20 below are the most populous in recent Census Bureau estimates. Investigators who work these counties regularly know where records are kept, how local judges handle scheduling and which courthouse a given suburb uses.

Investigation types

Investigations licensed Illinois investigators handle

These are common types of requests that can be referred to licensed Illinois private detectives. Each investigator decides which assignments to accept and how to carry them out. The short descriptions explain what the work generally involves in Illinois, so you can describe your situation clearly when the investigator contacts you.

• SurveillanceA licensed investigator observes and documents activity from public places, keeps a time-stamped log and writes a report. Illinois investigators plan around the all-party recording rule and the state's tracking and stalking laws.Learn more
• Child custody investigationsInvestigators document a parent's conduct, who is present during parenting time and conditions at exchanges, producing observations a family lawyer can present on allocation of parental responsibilities.Learn more
• Infidelity investigationsInvestigators confirm or rule out a suspected relationship through lawful observation and records work. Illinois is a no-fault divorce state, so findings often matter most for custody, dissipation or finances.Learn more
• Locates and skip tracingInvestigators find witnesses, heirs, debtors and lost contacts using public records, licensed databases and field checks, and may decline a locate that appears to put someone at risk.Learn more
• Background researchInvestigators review court, property, business and public records on a person or company. Employment and tenant screening falls under the FCRA and generally requires a consumer reporting agency.Learn more
• Asset searchesInvestigators research real estate, vehicles, business interests and court judgments to support collection, divorce or litigation strategy, within federal limits on obtaining financial account records.Learn more
• Insurance and workers' comp claimsInvestigators document a claimant's activities from public places, take statements and check claim history so adjusters and defense counsel can evaluate injury and disability claims.Learn more
• Criminal defense investigationWorking through defense counsel, investigators interview witnesses, photograph scenes, gather records and review discovery so the attorney can test the prosecution's case.Learn more

How matching works

How investigator matching works in Illinois

1. 01

   Send your request

   Use the contact form or call. Share what you need, the county and city, any deadline and the best way to reach you. Keep sensitive details short until you speak with the investigator.

2. 02

   Request review

   Delator Group reviews the request for completeness and a lawful purpose, and may ask a quick follow-up about location, timing or whether a court case is open.

3. 03

   Referral to an Illinois investigator

   The request goes to an independent private detective who holds an Illinois license and works in or near the county involved, so local courts and roads are familiar.

4. 04

   The investigator contacts you

   The investigator reaches out, discusses scope and method, quotes their own fee and, if you go ahead, signs a written agreement with you directly.

5. 05

   You verify and decide

   Before signing, look up the investigator and agency on the IDFPR License Look-Up. There is no obligation to hire, and the decision stays with you.

Licensing

How Illinois licenses private investigators

Illinois licenses the individual private detective and, when that detective runs a business with employees, the agency as well. IDFPR issues both and sets the qualifications, which include experience requirements and a state examination. Agency employees who do investigative work generally hold a PERC. Because Section 10-5 also bars unlicensed advertising and the use of investigator titles, checking the license is the quickest way to know you are dealing with someone the state actually authorizes.

Before you hire

What to check before you hire an investigator in Illinois

FAQ

Frequently asked questions

Nationwide

Find an investigator in another state