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NAICS Code· 561611

NAICS 561611: Investigation and Personal Background Check Services

This U.S. industry comprises establishments primarily engaged in providing investigation, detective, and personal background check services. Illustrative Examples: Fingerprint services Private detective services Polygraph services Private investigative services (except credit) Cross-References.Show more

NAICS 561611 – Investigation and Personal Background Check Services encompasses the conduct of security clearances, personnel vetting, criminal history reviews, credit investigations, and lifestyle assessments to support federal workforce integrity and national security compliance. These services are critical for ensuring the suitability, reliability, and trustworthiness of individuals seeking access to sensitive facilities, classified information, or critical infrastructure roles.

69
Active Contracts
$911.6M
Total Obligations (12mo)
617
Awarded Contracts (12mo)
273
Contractors Awarded (12mo)
1
Median Bidders per Award
+423.4%
YoY Growth
Dotted
NAICS 561611 FAQ

Frequently Asked Questions

NAICS code 561611 covers Investigation and Personal Background Check Services. This U.S. industry comprises establishments primarily engaged in providing investigation, detective, and personal background check services. Illustrative Examples: Fingerprint services Private detective services Polygraph services Private investigative services (except credit) Cross-References.

Recently Posted in Investigation and Personal Background Check Services

NAICS: 561611
Closed
SLED
CIT01277023_MTPD Background Investigation System
Solicitation # WMATA-0000010918
The Washington Metropolitan Area Transit Authority is seeking a provider for the MTPD Background Investigation System under solicitation number WMATA-0000010918. This procurement falls under NAICS code 561611, which pertains to investigation services. The solicitation was posted on September 29, 2026, with a very short response window, as the deadline for submissions is September 30, 2026. Interested parties can find further details and submit their responses through the official WMATA supplier portal.
Washington Metropolitan Area Transit Authority

POSTED

about 18 hours ago

CLOSED

15 days ago
View Details
NAICS: 561611
New
Federal
Request for Information - Fraud Defense Contracts
Solicitation # 270536
The Centers for Medicare & Medicaid Services (CMS) has issued a Request for Information (RFI) under solicitation number 270536 to gather industry feedback and innovative solutions for its future Fraud Defense Contracts. The primary objective is to enhance Program Integrity (PI) efforts to combat fraud and abuse within federal health care programs, specifically Medicare and Medicaid. CMS is proposing a new operating model that increases its own role in lead development, prioritization, and the direction of investigations. The agency is seeking input on the use of advanced analytics, artificial intelligence, SQL, and open-source intelligence (OSINT) to identify problematic actors and develop defensible law enforcement referral packages and administrative actions, such as payment suspensions and revocations. Interested vendors must submit their responses using the designated Interested Vendor Response form by 11 AM EST on November 4, 2026. The scope of work involves collaborating with various entities, including the Department of Justice, FBI, and the HHS Office of Inspector General, while maintaining strict security, privacy, and evidentiary safeguards. CMS is particularly interested in feedback regarding fixed-price contracting structures and strategies to mitigate organizational conflicts of interest for firms with existing health plan or provider business. This RFI is for informational and planning purposes only, and no contract will be awarded based solely on the responses provided.
Ofc Of Acquisition And Grants Management

POSTED

2 days ago

DEADLINE

in 20 days
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NAICS: 561611
New
SLED
Legal Process Serving and Document FilingThis subcontract for Legal Process Serving and Document Filing supports prime contractors working on projects for the County of Guilford Tax Department in North Carolina. The selected provider is responsible for serving summons, complaints, and notices of foreclosure to property owners, as well as filing essential legal documents with the Guilford County Clerk of Court. All activities must be performed in strict accordance with the North Carolina rules of civil procedure, with the provider delivering stamped court filings and proof of service affidavits. The opportunity is categorized under NAICS code 561611 and was posted on October 13, 2026. Interested parties must submit their responses by the deadline of November 6, 2026. This engagement ensures that the legal requirements for tax-related notifications and court documentation are met efficiently within the jurisdiction of the County of Guilford.
County of Guilford

POSTED

2 days ago

DEADLINE

in 22 days
View Details
NAICS: 561611
New
International
Pre Employment Checks
Solicitation # 3490
The Centre For Process Innovation Limited is seeking a suitably experienced UK-based contractor to provide a comprehensive Pre Employment Checks service for a three-year period from November 30, 2026, to November 29, 2029. The scope of work includes a wide array of screenings such as identity and Right to Work checks, DBS, driving licence verification, directors searches, adverse financial checks, and professional, education, and employment references. A critical requirement is the ability to conduct end-to-end BPSS checks, consolidating identity, right to work, criminal records, and employment history into a single report. The successful provider must offer an easy-to-use online portal for raising requests, tracking statuses, and securely retrieving outcomes. The contract is valued at an estimated 30,000 GBP excluding VAT and will be awarded based on a weighted scoring system of 60 percent quality and 40 percent price. Quality evaluations focus on service delivery and portal functionality, information security, and contract risk management. Specifically, the contractor must hold a recognized information security accreditation such as ISO 27001, support SSO authentication, and demonstrate the ability to deliver urgent reports within 24 hours. Proposals must be submitted electronically by November 2, 2026, at 12:00 pm.
Centre For Process Innovation Limited

POSTED

3 days ago

DEADLINE

in 18 days
View Details
NAICS: 561611
New
SLED
Motor Vehicle Audit
Solicitation # RFP027-31
The City of Meriden is soliciting proposals under RFP027-31 for a qualified external firm to conduct a comprehensive audit of motor vehicles operating within municipal borders that are registered out-of-state or fail to register locally. In accordance with Connecticut General Statutes 12-71 and 14-12a, the initiative aims to identify non-compliant vehicles to establish fair assessments and recover lost property tax revenue. The selected vendor will provide an end-to-end solution including data collection from public and proprietary sources, case investigation, and the management of taxpayer correspondence. Key deliverables include a secure online audit portal for the Assessor, structured data exports compatible with Quality Data Services or Vision software, and monthly progress reports. The contract features an initial one-year term with options for four one-year extensions, totaling up to five years. Performance milestones require an operational data collection framework within 30 days and the first batch of verified accounts within 90 days. Vendors must propose a compensation model based on a contingency fee, a per-validated-vehicle fee, or a hybrid of both, with payments issued no less than 30 days after service completion. Award selection is based on a points-weighted system evaluating technical competence, fee proposals, project schedules, personnel experience, and past performance. The successful contractor must maintain all required Connecticut state licenses and provide certificates of insurance for general, automobile, and workers compensation liability.
DAS Procurement

POSTED

6 days ago

DEADLINE

in 15 days
View Details
NAICS: 561611
New
SLED
RFP027-31 Motor Vehicle Audit
Solicitation # RFP027-31
The City of Meriden, Connecticut, is soliciting proposals under RFP027-31 for a consulting firm to conduct a comprehensive motor vehicle audit. The objective is to identify and verify vehicles operating within municipal borders that are registered out-of-state or remain unregistered, ensuring compliance with Connecticut General Statutes regarding vehicle registration and local municipal property taxes. The selected vendor will provide an end-to-end solution involving data collection from public and proprietary sources, investigation of potentially taxable vehicles, and administrative support for the Assessor. Key deliverables include a secure online audit portal for tracking compliance and photographic evidence, as well as monthly or quarterly data exports compatible with Quality Data Services or Vision software. The contract features an initial one-year term with options for four one-year extensions, totaling up to five years. Performance milestones require the data collection framework to be operational within 30 days and the first batch of verified non-compliant accounts delivered within 90 days. Award selection is points-based, evaluating technical competence, past performance, and knowledge of Connecticut assessment laws. Compensation will be based on a proposed contingency-based fee, a per-validated-vehicle fee, or a hybrid model. The successful contractor must maintain professional liability insurance, adhere to state records retention and Freedom of Information laws, and provide monthly invoicing with payment terms of at least 30 days.
Assessor

POSTED

6 days ago

DEADLINE

in 15 days
View Details
NAICS: 561611
New
SLED
Professional Practice Investigator (Educational Law Specialist)This subcontract for a Professional Practice Investigator specializing in educational law involves conducting in-depth investigations into the professional practices of prime contractors working on Utah State Board of Education projects. The selected provider will be responsible for interviewing relevant parties, gathering evidence, and applying educational law to develop comprehensive investigative reports for delivery to UPPAC and the USBE. A critical requirement of the contract is the implementation of secure data handling systems that maintain strict compliance with FERPA and the Utah Student Privacy and Data Protection Act. Interested parties must submit their responses by October 21, 2026, in accordance with the solicitation posted on October 9, 2026.
Utah

POSTED

6 days ago

DEADLINE

in 6 days
View Details
NAICS: 561611
New
SLED
USBE - Utah Professional Practices Advisory Committee (UPPAC) Investigators (REPOST)
Solicitation # USBE-MI27052-RFP
The Utah State Board of Education is seeking qualified independent investigators to serve the Utah Professional Practices Advisory Committee (UPPAC) on a rotating or random basis. The primary objective is to conduct in-depth investigations into professional practices and produce detailed investigative reports. The resulting contract or contracts will run through June 30, 2027, with the possibility of four additional one-year renewal options. While investigators are expected to handle approximately 7 to 10 investigations per month, there is no guaranteed minimum volume of work. Selected contractors will be paid a mandatory flat rate of $100 per hour, which remains constant through any renewal periods. All costs are all-inclusive, meaning travel, meals, and lodging are the contractor's responsibility unless prior authorization is granted for hearings outside of Salt Lake County. Invoices must be submitted electronically and are payable within 30 days of receipt. To be eligible, offerors must meet mandatory minimum requirements, including providing a writing sample of no more than 10 pages, agreeing to the flat hourly rate, and certifying that they do not represent educators facing UPPAC discipline. High ethical standards are required, and contractors must disclose any potential conflicts of interest involving schools, districts, or the Utah State Board of Education. Furthermore, contractors must strictly adhere to data privacy laws, including FERPA and the Utah Student Privacy and Data Protection Act, ensuring all student-level data is protected and destroyed upon contract termination.
Utah

POSTED

6 days ago

DEADLINE

in 6 days
View Details
NAICS: 561611
New
Federal
Forensic Polygraph Examination ServicesThis 8(a) sole source subcontract for Forensic Polygraph Examination Services supports prime contractors working on US District Court projects for the US Probation and Pretrial Services Office in Anchorage, Alaska. The selected provider will conduct forensic examinations using APA-accredited techniques to verify honesty and examine sexual histories, delivering comprehensive case files and typed reports. To qualify, the provider must be a graduate of an APA-accredited school and hold Post-Conviction Sex Offender Testing certification. Required infrastructure includes specialized polygraph instrumentation, audio and video recording capabilities, and record systems that maintain full HIPAA compliance.
Ak US District Court

POSTED

6 days ago

DEADLINE

in 22 days
View Details
NAICS: 561611
New
Federal
Forensic Polygraph services
Solicitation # 097--27-04PO
The United States Probation and Pretrial Services Office for the District of Alaska is soliciting forensic polygraph vendors to establish Blanket Purchase Agreements for services in the Anchorage area, including Eagle River, Girdwood, and Glen Alps. The scope of work involves performing clinical polygraph examinations to examine defendants' lifetime sexual histories or identify unreported offense behaviors, as well as maintenance examinations to verify honesty regarding community supervision and sex offender treatment. This is an 8(a) Sole Source solicitation under NAICS code 561611, with a response deadline of November 6, 2026. Qualified vendors must provide staff with a baccalaureate degree or five years of law enforcement experience, graduation from an APA-accredited school, and certification in Post-Conviction Sex Offender Testing. Award selection is based on technical acceptability via pass/fail criteria and the lowest total evaluated price. Key requirements include the delivery of typed reports within 10 business days, maintenance of secure and HIPAA-compliant records, and the ability to provide immediate testing without backlogs. Vendors must maintain facilities that meet all building codes and accessibility standards and are subject to site inspections and independent quality reviews. Invoicing must be submitted monthly by the 10th day of the month, with separate invoices for pretrial services and probation supervision.
Ak US District Court

POSTED

6 days ago

DEADLINE

in 22 days
View Details
NAICS: 561611
SLED
RFB-IS-27200233 - RFSS-2026-2027-00001 BACKGROUND CHECK SERVICES - SOW
Solicitation # 232422
The City of Los Angeles is seeking proposals for background check services under solicitation number 232422, also identified as RFB-IS-27200233 and RFSS-2026-2027-00001. This local government opportunity requires vendors to provide comprehensive background screening services as outlined in the statement of work. The performance of these services will be centered in Los Angeles, California. Interested vendors must submit their responses by the deadline of October 19, 2026, at 10:00 PM UTC. Participation may require registration through the City of Los Angeles official website. All inquiries regarding the content or requirements of the bid should be directed to the originating organization.
City of Los Angeles

POSTED

7 days ago

DEADLINE

in 5 days
View Details
NAICS: 561611
SLED
Regional Field Background InvestigatorsThis subcontract opportunity is for Regional Field Background Investigators to support prime contractors on projects for the NYS Commission Gaming. The selected provider will perform critical on-the-ground investigative tasks, including conducting in-person interviews with subjects and references, verifying employment and residential addresses, and performing manual record searches at municipal offices and courthouses. Deliverables include comprehensive field interview notes, verified copies of records, and detailed regional investigation reports. To be eligible, investigators must possess a valid New York State Private Investigator license and utilize secure mobile data transmission tools for all communications. The solicitation was posted on October 8, 2026, with a response deadline of December 3, 2026. This work falls under NAICS code 561611 and is focused on ensuring thorough background verification within the state of New York.
NYS Commission Gaming

POSTED

7 days ago

DEADLINE

in about 2 months
View Details

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