Evidence Collection, Review, Analysis & Storage | Tucson & Phoenix Private Investigators


“That which can be asserted without evidence can be dismissed without evidence.”

Christopher Hitchens

A defendant’s case is only as good as the facts that can be credibly established in a court of law. We have earned our reputation as Arizona’s most skilled criminal defense investigators when it comes to collecting relevant evidence needed to establish facts or bring them into question. In doing so, we have also developed the expertise to become the first investigative agency defense attorneys call for evidence review, analysis, and storage.


You don’t have to be a lawyer to grasp that the trier-of-fact needs relevant facts to weigh in order to determine guilt or innocence. Our system requires evidence of guilt beyond any reasonable doubt to support a conviction. If you’ve ever been charged with a crime you didn’t commit, you know all too well the strength of this requirement.

Generally speaking, evidence is information given personally, drawn from a document, or in the form of material objects, tending or used to establish facts in a legal investigation or admissible in court. Without evidence, there can be no conviction. Yet, there are innocent people in prison. So, it’s best to put together the most persuasive defense possible. And that’s where our abilities to collect, review, analyze, and store evidence can really help.

Every crime scene has a wide gamut of potential evidence. Without getting granular and exhaustive of the types and variations, do not doubt our efficacy and professionalism in securing evidence and determining its probative value. From witnesses to property and photos to trace analysis, our expertise in handling evidence is well known in Arizona.


Mishandling of evidence is the scourge of criminal defense investigations. We have no tolerance for shoddy evidence gathering. Whatever the evidence, whatever the type of alleged crime, we will work exhaustively to find the best way to have it thoroughly examined in a manner that will be pertinent and persuasive under judicial scrutiny.

Our investigators have years of experience reviewing and analyzing the spectrum of facts and details encountered in criminal cases. And, in a world that’s constantly changing, we are continuously learning state-of-the-industry techniques for analyzing new types of evidence. It’s all part of helping our clients establish the most relevant and persuasive evidence possible so they can win their case. Without divulging our techniques and expert proficiencies, we can say with confidence that no investigator in Southern Arizona handles evidence with the competency of Inter-State Investigative Services.

We are driven to provide the highest quality investigative resources to criminal defense attorneys and their staff.  We gather, review, analyze, and store the facts of any case with unparalleled professionalism. We fully understand that we are only as good as the next case we help win. Whatever kind of criminal case you have, we offer Arizona’s best evidence review and analysis. Simply click on the “Submit a Request” button at the top of the page, or call IISAZ now at (520) 882-2723 or (602) 358-7759, and we’ll get started investigating your defense.