Phase Four Investigations is a leader in the field of Michigan private investigations, surveillance, and evidence gathering. We are fully bonded, licensed and insured. Our combined experience of over 35 years is the key to achieving the results you need and expect. We use ongoing training and skill specialization to ensure we provide exactly the right team for your case. We are relentless in the pursuit of the facts. We know you have options when selecting a private investigator or security professional. There are hundreds of agencies from which to choose, but there are many reasons to choose Phase Four.