In most states, yes — investigating for hire without a license is illegal. A handful of states don't license PIs at all, and a few license by city or county instead. Where you'll work is what matters, not where you live.
License, board, and working across state lines
Most states require a state-issued license to do investigative work for a client, usually with experience, an exam, insurance, and a background check. A small group of states don't license investigators at all, and a few hand licensing to counties or cities rather than a central board.
The bigger trap is working across state lines. A case that crosses into another state can require a license there too. Some states offer reciprocity or short-term work permits for out-of-state investigators; many don't. The state block above shows whether a license is required, the official board to check with, and how that state handles out-of-state PIs.
What to watch out for
Doing surveillance or investigative work for pay without the required license can be a criminal offense — and can taint the evidence you gather. Confirm before you take a case.
Where it exists, reciprocity usually comes with conditions — days worked, origin in your home state, or a temporary permit. Don't assume your license travels; check the board.
Already need an investigator?
If you're not becoming a PI but need to hire one, this same data tells you whether the person you're hiring must be licensed in your state — a basic way to avoid someone operating illegally. Look up the official board above and verify the license.
Get matched to a licensed investigator
Skip the guesswork — connect with a licensed investigator who's cleared to work your state.
Start a caseGeneral legal information only, not legal advice. No attorney–client or investigator relationship is created by reading this.
This guide is general information, not legal advice, and licensing rules change. Requirements, exemptions, and reciprocity vary by state and sometimes by county. Confirm the current rule with the official licensing board before working a case.