Private Investigator Retainer Agreements in Tennessee, Explained

01The basics

What a retainer agreement actually does

A retainer agreement, sometimes called an engagement agreement, is the written contract between you and the investigation firm. It records what you asked for, what the firm agreed to do, how you will be billed, and the rules for changes and cancellation. The retainer itself is usually a deposit paid up front and applied to the work as it happens.

In Tennessee, private investigation companies are licensed under the Private Investigators Licensing and Regulatory Act, so the agreement should name the licensed company you are hiring. Read it as a planning document, not a formality. If something you discussed on the phone is not in writing, ask for it to be added.

02The heart of it

Scope of work and deliverables

The scope describes the question the investigation is meant to answer and the work planned to answer it. Strong scope language is specific: surveillance of a named subject on stated days in Davidson County, or a locate for a defendant with a last known address in Shelby County. Weak scope language says only investigative services as needed.

Deliverables describe what you receive. That might be a written report with a time-stamped log, photographs or video, a summary of records searched, or a sworn affidavit. If you may need the investigator to testify, the agreement should say how testimony is scheduled and billed. Clear deliverables also make it easier to judge whether the work was completed as agreed.

• The investigative question in one or two sentences
• Planned methods and the counties involved
• Dates or hours of fieldwork, where relevant
• The form of the final report and media
• How testimony or affidavits are handled

03How you pay

Billing basis and expenses

Agreements usually bill by the hour, by the day, by the task, or as a defined project. None is automatically better. What matters is that you know which applies and what counts as billable time, including travel, report writing and time spent on calls. Ask whether there is a minimum for a surveillance day or a minimum number of hours.

Expenses are a separate line. Common examples are mileage, public records and court copy fees, database searches, and lodging for out-of-area work. A clear agreement lists which expenses may be charged and whether any need your approval first. Delator Group puts scope, timeline and cost in writing before work begins, so expense rules are settled up front rather than discovered on the invoice.

04Your deposit

Retainer draws, statements and refunds

Most retainers work as a balance the firm draws against. The agreement should say how often you receive statements, what happens when the balance runs low, and whether additional funds are required before work continues. You should never be surprised by a request to replenish in the middle of a surveillance day.

Read the refund clause carefully. Some firms refund unused retainer funds once the case closes; others treat part of the retainer as non-refundable to cover intake and planning. Neither approach is improper if it is written plainly. What you want is a clear statement of how any balance is handled and on what timeline.

05Protections

Confidentiality, scope changes and cancellation

A good agreement states that your information and the results are kept confidential, while acknowledging that a subpoena or court order may legally require disclosure. If your attorney is retaining the investigator, the agreement may say that the work is being done at counsel's direction, which can matter for work-product questions.

Cases change. A subject moves, a new lead surfaces, or you decide one day of surveillance is enough. The agreement should require your written approval before the scope or budget grows, and it should explain how either side can end the engagement, what notice is needed, and how work already done is billed.

06Before signing

Red flags in an investigation contract

Be cautious if an agreement has no written scope, no description of deliverables, or unlimited authority to add hours and expenses. Promises of guaranteed results are another warning sign, because no honest investigator can guarantee what a subject will do. Language that authorizes illegal methods, such as obtaining phone records or placing a tracker without consent, is a reason to walk away.

You should also be able to verify the company license and know who will do the work. If a firm is unwilling to explain a clause or put a verbal promise in writing, treat that as your answer. For a broader list of what to ask, see our guide on questions to ask before hiring.

• No written scope or deliverables
• Open-ended hours or expenses without your approval
• Guaranteed outcomes
• Any mention of methods that break the law

Interactive checklist

Retainer agreement review checklist

Confirm each item is in writing before you sign and pay the retainer.

Step by step

How Delator puts an engagement in writing

1. 01

   Consultation with leadership

   We talk through the facts, your goal and any court deadlines.

2. 02

   Written scope and cost

   You receive the scope, timeline and cost in writing before any work begins.

3. 03

   Review and sign

   We answer questions on any clause, and you sign only when it matches what we discussed.

4. 04

   Updates against the plan

   Work proceeds inside the written scope, and any change is approved by you first.

Compare

Clear language versus vague language

FAQ

Frequently asked questions