Under Federal Investigation? What Each Agency Actually Does

Most people learn they are under federal investigation when two agents appear at the door and ask for a few minutes. What they are investigating is usually a mystery to the person answering.

The agency itself is the clue. IRS-CI does not investigate firearms. ATF does not investigate tax. Which badge you saw narrows the field enormously — and it tells your lawyer where to start.

The five ways people learn they are under investigation

1. Agents at the door. Usually two, usually unannounced, usually framed as routine. It is not routine.
2. A target letter from a United States Attorney’s Office.
3. A grand jury subpoena — to you, or to your bank, employer, or accountant.
4. A search warrant executed at your home or business.
5. Someone else tells you they were interviewed about you, or that their records were subpoenaed.

All five mean the same thing: the investigation predates your knowledge of it, often by a year or more.

Which agency handles what

• FBI — the broadest jurisdiction: public corruption, white collar fraud, healthcare fraud, cyber, civil rights, violent crime, terrorism
• DEA — controlled substances, trafficking organizations, and registrant diversion
• ATF — firearms, explosives, arson
• IRS-CI — tax crimes, money laundering, currency reporting
• HSI — customs, export control, smuggling, trafficking, child exploitation
• Inspectors General — programme fraud at HHS, VA, SSA, DoD and others
• Secret Service — counterfeiting, access device fraud, financial cybercrime
• USPIS — anything that touched the mail
• DEA Diversion — doctors, pharmacists, and other registrants
• SEC referrals — securities matters that become criminal
• DOJ components — who actually decides to charge
• Task forces — how a local arrest becomes a federal case

The tools they use

Grand jury subpoenas for testimony and records. Administrative subpoenas — the DEA and several Inspectors General can compel records without a grand jury at all. Search warrants, including for phones, cloud accounts, and email. Wiretaps under Title III, which require far more than a warrant and are heavily used by DEA. Cooperating witnesses, usually people facing their own exposure. Consensual recordings, where one party consents and you are the other party. Financial analysis from bank records and suspicious activity reports.

Notably absent from that list: your voluntary interview. That is the one tool they cannot use unless you hand it to them.

Four rules regardless of the badge

1. Do not talk. Politely decline and ask for a lawyer. It is not obstruction and it cannot be used against you.
2. Do not consent to a search. If they had a warrant they would not be asking.
3. Do not destroy anything. The preservation duty starts the moment you know.
4. Do not warn anyone. Calling a co-worker to compare notes is witness tampering.

Why the pre-charge stage is worth the most

Before an indictment, the charging decision has not been made. Loss figures have not hardened. No prosecutor has committed publicly to a theory. Declination, a narrowed set of counts, and resolution by information are all genuinely available — and none of them survive an indictment intact.

That is the whole argument for retaining counsel at the door rather than at the arraignment.