CGIS Investigation Lawyer: Defending Coast Guard Members Under Investigation

Written by Michael Waddington, court-martial defense attorney, former Army JAG, and former Trial Defense Service Senior Defense Counsel. Gonzalez & Waddington defends service members in military investigations and courts-martial worldwide. Last updated: August 30, 2026.

If the Coast Guard Investigative Service (CGIS) has contacted you, asked you to “come in and talk,” seized your phone, or read you your Article 31(b) rights, you are likely the suspect in a criminal investigation — not a witness. What you say and do in the next few days can determine whether your case ends quietly or ends at a court-martial. This page explains what CGIS is, how its investigations actually work, the rights you have right now, and how a civilian military defense lawyer can intervene before charges are ever preferred.

What Is the Coast Guard Investigative Service?

CGIS is the Coast Guard’s counterpart to Army CID, NCIS, and OSI. It is a federal law enforcement agency staffed by civilian special agents (GS-1811 criminal investigators) alongside active duty and reserve agents. CGIS agents carry firearms, execute search warrants and command authorizations, make arrests, and conduct criminal investigations worldwide — afloat and ashore.

One feature makes CGIS cases different from those of the other services: the Coast Guard sits inside the Department of Homeland Security, not the Department of Defense. Coast Guard members are still fully subject to the Uniform Code of Military Justice, but CGIS routinely works alongside other DHS components, the FBI, DEA, and U.S. Attorneys’ offices. A CGIS investigation can move between military justice and federal civilian prosecution, and evidence gathered by CGIS can be shared with civilian authorities. That is one more reason not to give a statement before speaking with counsel.

CGIS’s mission, authority, and relationship to Coast Guard commands are set out in COMDTINST 5520.5G, Coast Guard Investigative Service Roles and Responsibilities. Under that instruction, CGIS — not the command — controls criminal investigations. Your commanding officer generally cannot shut down or steer a CGIS case, and CGIS reports its findings back to the command and servicing legal office when the investigation ends.

What CGIS Investigates

CGIS handles felony-level and other serious allegations involving Coast Guard personnel, property, and operations. Common investigations include: sexual assault and sexual contact offenses under Article 120, UCMJ; drug offenses — use, possession, distribution, and positive urinalysis cases — under Article 112a; larceny, BAH/travel-claim fraud, and government credit card abuse under Article 121 and related articles; child pornography and online solicitation offenses; assault and domestic violence; false official statements under Article 107; orders violations under Article 92; and death, serious injury, and major mishap cases with potential criminal exposure.

CGIS also investigates civilian crimes touching Coast Guard equities — contractor fraud, crimes aboard vessels, and offenses within the special maritime and territorial jurisdiction of the United States.

How a CGIS Investigation Actually Works

Understanding the sequence matters, because the best opportunities to influence the outcome come early — usually before you even know how much CGIS has done.

1. Initiation

Cases start with a complaint to command, a restricted or unrestricted sexual assault report, a positive urinalysis, a tip line report, a referral from another agency, or findings from an administrative investigation. CGIS screens the allegation and opens a case file. You will almost never be notified that this has happened.

2. The quiet phase

Before approaching a suspect, agents typically interview the complainant and witnesses, pull records — messages, financial records, duty logs, medical records — and may seek search authorizations for phones, lockers, vehicles, or barracks rooms. In some cases they arrange pretext communications: a monitored call or text exchange in which the accuser, working with agents, tries to get you to apologize or admit something. If someone unexpectedly wants to “talk about what happened” by phone or text, assume the conversation is being recorded.

3. The suspect interview

Eventually agents contact you — often through your chain of command, with an instruction to report to the CGIS office. The setting is designed to feel routine. It is not. Agents will read you your Article 31(b) rights, ask you to sign a waiver, and then use trained interrogation techniques: minimizing the offense, suggesting that “telling your side” will help, implying they already have overwhelming evidence, or offering theories that sound like an out but are actually confessions (“it was consensual but things got out of hand,” “you just borrowed the money”). They may ask you to consent to a search of your phone or to take a polygraph. You can decline all of it.

4. Report of investigation

When CGIS finishes, it does not decide your fate. It writes a Report of Investigation (ROI) and forwards it to your command and the servicing legal office. The command, with JAG advice, decides what happens next — which is why advocacy directed at the command decision-maker, before that decision is made, can matter as much as anything that happens in the interrogation room.

Your Rights During a CGIS Investigation

Coast Guard members have rights that are, in some respects, broader than the Miranda rights civilians receive:

• Article 31(b) rights. Under 10 U.S.C. § 831, no one subject to the UCMJ may interrogate or request any statement from a suspect without first informing them of the nature of the accusation, advising them they need not make any statement, and warning that any statement may be used against them. These warnings apply to questioning by CGIS agents and by your chain of command.
• The right to remain silent — completely. Declining to answer questions cannot lawfully be used against you at a court-martial. You do not have to explain, justify, or “just clear up” anything.
• The right to counsel. You may stop any interview at any time and ask for a lawyer. You may consult a Coast Guard defense counsel at no cost, hire civilian defense counsel, or both.
• The right to refuse consent searches. If agents had enough for a warrant or command authorization, they would usually not be asking. You may politely decline to consent to a search of your phone, car, or belongings — and decline to provide your passcode.
• The right to refuse a polygraph. Polygraph results are generally inadmissible, but the interrogation before and after the machine is where cases are lost. You can say no.

Exercising these rights is not an admission of anything. Agents document rights invocations routinely, and the invocation itself is not evidence of guilt.

Seven Mistakes That Sink Coast Guard Members

1. Talking to CGIS without counsel. The single most damaging decision suspects make. Innocent people talk themselves into charges by guessing, minimizing, or misremembering.
2. Assuming you are “just a witness.” Agents are not required to tell you the full scope of their investigation. If you are being asked questions and read your rights, treat yourself as the suspect.
3. Consenting to phone searches. Modern cases are built on extractions of texts, photos, and location data. Consent hands it all over without judicial review.
4. Contacting the accuser or witnesses. This can generate new charges — obstruction, violation of a no-contact order under Article 92 — even if the original allegation is weak.
5. Deleting messages or “cleaning up” your phone. Deletion is often recoverable, and the act of deletion becomes evidence of consciousness of guilt or a separate obstruction offense.
6. Venting to shipmates. Anyone you talk to can become a government witness. Conversations with your lawyer are privileged; conversations at the smoke pit are not.
7. Waiting until charges are preferred to get a lawyer. By then, the interview is over, the phone is imaged, and the command may already be leaning toward court-martial. Early representation is when a lawyer has the most room to work.

What Can Happen After a CGIS Investigation

A completed CGIS investigation can lead anywhere from case closure to a general court-martial. The command’s realistic options include:

• No action / case closed. Insufficient evidence, or the command declines to act. This outcome is more likely when the defense engages early and presents exculpatory evidence before decisions are made.
• CG-3307 (“Page 7”) entry. A negative Administrative Remarks entry in your record — career damage without a hearing, and often a predicate for later separation.
• Captain’s Mast (NJP). Nonjudicial punishment under Article 15, UCMJ. Unlike members of the other services attached to or embarked in a vessel, the right to refuse mast is limited in the Coast Guard’s shipboard context — advice on whether and how to contest NJP is fact-specific.
• Administrative separation. For enlisted members, processing under the Military Separations manual, COMDTINST M1000.4 (series), potentially with an Other Than Honorable characterization that follows you into civilian life. Members with sufficient service, or facing OTH characterization, are generally entitled to an administrative separation board.
• Officer adverse actions. Officers may face a Board of Inquiry, revocation of aviation or cutterman designations, promotion delays, or show-cause proceedings.
• Court-martial. Preferral of charges, an Article 32 preliminary hearing for general court-martial referrals, and trial by special or general court-martial, with possible punitive discharge, confinement, and — for qualifying offenses — federal conviction and sex offender registration.
• Federal civilian prosecution. Because CGIS works within DHS and alongside U.S. Attorneys, some cases are referred for prosecution in U.S. District Court instead of, or in addition to, military action.

Titling: the consequence nobody warns you about

When CGIS opens an investigation and finds credible information that you committed an offense, you are “titled” — listed as the subject in the report of investigation — and the matter may be indexed in federal law enforcement databases. Titling is an investigative record, not a finding of guilt, and it can persist even if you are never charged or are acquitted. It can surface in security clearance adjudications, federal employment background checks, and firearm purchases. Challenging titling and indexing after the fact is difficult, which is another reason to fight the case at the investigation stage rather than after the ROI is written.

What a CGIS Investigation Lawyer Actually Does

People sometimes assume a lawyer only matters at trial. In a CGIS case, much of the decisive work happens before charges exist:

• Shutting down the interrogation. Once you are represented and invoke your rights, agents must stop questioning you. That alone removes the government’s most productive source of evidence — your own words.
• Controlling contact with investigators. All communication runs through counsel. No surprise phone calls, no “quick follow-up questions,” no pretext calls that work.
• Conducting a parallel defense investigation. Locking down favorable witnesses, preserving texts and location data that support your account, and identifying inconsistencies in the accusation while memories are fresh.
• Litigating search and seizure issues. Evaluating whether command authorizations and warrants were properly obtained, and positioning suppression issues for later motions practice.
• Advocating before the decision is made. Presenting exculpatory evidence and legal analysis to the command and servicing legal office before disposition — the window in which cases get resolved at the lowest possible level or closed outright.
• Defending every forum. If the case proceeds, representing you at mast, an administrative separation board, a Board of Inquiry, an Article 32 hearing, or a court-martial — and in security clearance and titling-related proceedings that follow.

Coast Guard defense counsel are dedicated professionals, and you should request one. Many members also retain civilian counsel for additional bandwidth, independence from the military chain, and continuity — a civilian lawyer stays on your case regardless of transfers or detailing. You may have both.