Private Investigator Arizona

Inter-State Investigative Services is a private investigation firm helping clients across Arizona for over 30 years.

Inter-State Investigative Services is a private investigation firm based in Arizona with Licensed Investigators across the state, including Tucson, Phoenix, Flagstaff, Nogales, and all surrounding areas. We provide a full range of services in a variety of different fields, including insurance investigations, criminal defense, civil defense, domestic investigations, pre-employment background screenings, and more.
Believe us when we say there is no case too big or too small – we treat all cases with the same attention to detail and respect. We are professional, discreet and courteous, so if you have a problem that may require an investigator, contact us now and see how we can help!

For a private investigator, call 1-800-729-0311.

What to Expect

1. Set up a Free Consultation with Inter-State

During our consultation, we’ll chat about how we plan to handle your situation and what services we’ll provide. If you’re on board, we’ll start your case and assign it to the investigator or team best suited for your needs.”

2. Establish a Budget for Your Investigation

Throughout your consultation, our team of investigators will evaluate your requirements, outline the investigative steps necessary to achieve your objectives, and establish a financial plan for your case. Once the budget is set, you’ll be asked to sign a client agreement and provide an initial payment to retain our services

3. Opening a Case and Beginning the Investigation

While we conduct the investigation, our team of private investigators assigned to your case will ensure you stay informed about their progress. They may also reach out to you periodically to gather any additional information needed

4. Final Case Report

When we wrap up the investigation, your designated investigator will offer you a choice. You can either have a meeting, whether by phone or in person, to go over the investigative results, or you can opt for a written report that summarizes all the findings from the investigation.

Certified Spanish Court Interpreter – On Staff

They can translate documents, intervention, depositions and also act as a certified notary


Criminal Defense Investigations

Civil Cases

Pre-Indictment Investigations

Background Investigations

Arizona Insurance Cases

Special Assistance in Mexico

Cases don’t always fit neatly into a single category. If you’re not sure what kind of case you have, call for a free consultation and we will discuss it with you.


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  • Pre-indictment investigation

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Surveillance Misconceptions

The amount of evidence required to prevail in court is often the biggest surprise to clients. 

In some cases, this can be even more true than others. In child custody cases, for example, it’s not enough to catch your ex-wife or husband in a single act of bad parenting. Rather, you need to establish a pattern of behaviors to convince the Court.

Painting this kind of picture can require much more surveillance than most people think. In fact, surveillance is largely a waiting game and it can take several attempts just to make one successful observation.

What is your role as a client?

Your role is to share as much information as possible with your investigative team. The more information you can share, the better. It makes the investigation more efficient and saves you money. 

Additionally, you should be as proactive as possible, although always in consultation with your investigative team, and your attorney if you have one. Certain types of information will be more readily accessible to you than it will be even to the most seasoned, professional private investigator. Family medical and financial records, for example, may be easier and faster for you to obtain than for a third party like a PI. 

We’ll discuss these issues in detail during your free consultation and help you come up with a list of ways that you can help in your investigation.

How quickly can you initiate an investigation once hired?

We strive to initiate investigations promptly upon being hired. The exact timeline may vary based on the nature and complexity of the case, but our goal is to start the investigation process as quickly as possible to ensure timely and thorough results for our clients.

What can I expect during the investigation?

During the investigation, our skilled team will assess your situation carefully and confidentially. Employing a multifaceted approach, we will diligently gather information, engage in thorough interviews with relevant individuals, and produce detailed reports of findings. Throughout the investigative process, we are committed to maintaining open lines of communication, ensuring that you are consistently updated on developments. Our aim is to give you complete and trustworthy results based on your requirements.


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