MI Private Investigator common mistakes
MI Private Investigator · Understand the traps and how to avoid them.
Treating the Michigan licensing threshold as if any paid investigative work requires a license, or conversely assuming an unlicensed person may take on a single small case, instead of applying the statutory definition of 'private investigator' and the licensing/registration structure under the Private Security Business and Security Alarm Act.
Candidates study the Act's penalty provisions but skim the definitions section, so they never pin down who must be licensed, who may work under a licensee, and what exemptions apply. The Act is often summarized in prep material without the definitional detail, so the candidate memorizes penalties without the trigger.
What to do instead
Build a one-page decision tree straight from the Act: is the person providing investigative services for hire, does an exemption apply (e.g., attorney, insurer employee, or another licensed category), and does the work fall under a different license class? For each branch, write the exact statutory term you are relying on. Then test yourself with five short fact patterns where the answer turns only on the definition.
Assuming a private investigator has the same arrest, search, or detention powers as a police officer, and answering questions about citizen's arrest, detention, or evidence handling as though the investigator carries police authority.
Popular media and prior law-enforcement experience create a mental shortcut. Candidates also conflate the common-law citizen's arrest privilege with statutory authority and forget that a private investigator is generally a private citizen whose authority comes from the client's property rights and consent, not from the state.
What to do instead
Write out two columns: 'peace officer authority' and 'private citizen authority.' For arrest, detention, search, and seizure, note the source of authority in each column and the consequence of exceeding it (tort liability, criminal exposure, suppression). Practice explaining to a hypothetical client why you cannot do what an officer could.
Answering search-and-seizure questions by applying the Fourth Amendment exclusionary rule to purely private conduct, rather than recognizing that the constitutional limit binds government actors and that private investigators face trespass, invasion of privacy, and statutory claims instead.
The state-action doctrine is taught early and then forgotten under exam pressure. Candidates see 'warrantless search' and reflexively reach for the exclusionary rule without asking who conducted the search and whether government involvement converts private action into state action.
What to do instead
Before answering any search question, ask two gating questions: who acted, and was there government direction or joint action? Then map the answer to the correct body of law: constitutional (if state action) versus tort and statutory (if private). Memorize the fact patterns that can create state action, such as acting at police direction or handing evidence to police in a way that makes the investigator an agent.
Conflating stalking, harassment, and lawful surveillance, and failing to identify when repeated following, monitoring, or contact crosses into prohibited conduct even when the investigator is working a legitimate case.
Candidates learn the stalking statute as a list of elements but do not connect it to their own surveillance conduct. They assume a retainer or a client's instruction immunizes conduct, and they overlook that the investigator's own pattern of conduct can satisfy the elements regardless of intent to gather evidence.
What to do instead
Write the stalking elements as a checklist and apply them to a surveillance scenario you design: pattern of conduct, course of conduct over time, and the victim's reasonable fear or emotional distress. Add a separate note on how a legitimate purpose affects (or does not affect) liability. Then list three surveillance tactics that are lawful and three that risk crossing the line, with the reason for each.
Describing chain of custody as a single signature or a form to fill out, instead of a continuous, documented record of every transfer, storage location, and person who handled the item from collection to production.
Chain-of-custody questions look administrative, so candidates give a shallow answer. They also confuse chain of custody with evidence authentication and with the report narrative, and they omit gaps such as unlogged storage or unrecorded handoffs.
What to do instead
Draft a sample custody log with columns for item description, collector, date and time, location, each transfer with signatures, and storage conditions. Then write a short paragraph on what a gap in the log means for admissibility and weight. Practice spotting the break in a three-transfer scenario you write yourself.
Writing reports that mix observation with conclusion, use vague qualifiers, or omit the who/what/when/where/how, so the report cannot support the client's decision or withstand cross-examination.
Candidates write reports the way they write emails, compressing facts and inserting opinions. They also skip the discipline of separating what was directly observed from what was told to them by a witness or learned from a record.
What to do instead
Adopt a fixed report skeleton: identification of the investigator and case, scope and authorization, chronology of activity, observations stated as fact, statements attributed to their source, documents reviewed, and exhibits. Keep a separate 'opinion' section, clearly labeled. Rewrite one weak paragraph into the skeleton and compare word by word what changed.
Treating public-record and motor-vehicle-record access as unlimited once the investigator holds a license, and failing to apply permissible-purpose and consumer-reporting limits to background investigations.
Candidates assume a license is a master key. They do not distinguish records available to the public from records released only for permitted purposes, and they overlook that a background report assembled for an employment or tenant decision may fall under consumer-reporting rules with notice and consent obligations.
What to do instead
Make a table of the record types you will actually use: court records, property records, corporate filings, driving records, and credit or consumer information. For each, note who may obtain it, for what purpose, and what consent or notice is required. Write one sentence on the consequence of obtaining a record for an impermissible purpose.
Accepting a client's stated objective without screening for conflicts, illegal purpose, or improper use of the investigation, such as a domestic case that is really pretext for harassment or a background check used to retaliate against a protected characteristic.
Candidates focus on the mechanics of the engagement and treat client screening as a formality. They also do not recognize that a conflict can arise from a prior representation, a family relationship, or a competing client in the same matter.
What to do instead
Build an intake checklist: identity of the client and the real party in interest, stated purpose, any prior or current relationship with the subject, and any indicator of an unlawful objective. Write down the questions you would ask and the point at which you would decline. Practice with two scenarios where the stated purpose and the likely purpose diverge.
Quoting a fee or signing a contract that leaves scope, expenses, cancellation, and deliverables undefined, then discovering the dispute only when the client refuses to pay or demands work outside the retainer.
Candidates treat the engagement letter as boilerplate and copy language without understanding what each clause allocates. They also underestimate how much of the exam's business-operations content turns on the allocation of risk and cost.
What to do instead
Draft your own engagement letter from scratch with sections for scope, exclusions, hourly and expense terms, retainer and replenishment, cancellation, deliverable format, confidentiality, and limitation of liability. For each clause, write one sentence on the risk it allocates. Then identify which clauses a client is most likely to dispute.
Ignoring personal and workplace safety planning during surveillance and field work, such as failing to establish a cover story, a check-in schedule, an exit route, or a de-escalation plan, and answering safety questions as if they were about equipment only.
Safety content is often studied as a gear list. Candidates memorize cameras and radios but not the planning discipline, and they underestimate how quickly a routine domestic or workers'-compensation surveillance can become confrontational.
What to do instead
Write a pre-surveillance plan template: objective, location and layout, cover and pretext boundaries, communications and check-in intervals, abort criteria, law-enforcement contact plan, and post-operation reporting. Add a short section on vehicle and foot surveillance hazards. Run one scenario through the template and note where you would abort.