Up to Thirty Days Per Year
Washington allows some out-of-state operation for up to thirty days per year, but only under a limited rule tied to comparable registration or certification and training standards.
Last updated: March 7, 2026
Can an Out-of-State Private Investigator Work a Washington Family-Law Case?
Sometimes, yes, but not in the broad way many people assume. Washington allows certain limited out-of-state PI activity, and the details matter. The real question is not whether someone says they work nationwide. It is whether their authority, assignment structure, and marketing claims actually fit Washington's rules.
The Short Answer
Washington has more than one path for limited out-of-state PI work, but neither path is the same thing as full Washington licensure. The structure matters more than the marketing.
| Question | Why It Matters | What a Clear Answer Sounds Like |
|---|---|---|
| Are you relying on Washington's thirty-day cross-state rule? | Washington allows only limited in-state operation under that path, not open-ended Washington work. | The investigator can explain that they are properly registered or certified in another state, meet comparable training standards, and are staying within the state's thirty-day limit. |
| Are you relying on a temporary-assignment path? | Washington separately recognizes a temporary-assignment path tied to a valid similar card and a same-employer structure. | The investigator can explain how the ninety-day temporary-assignment window applies and why the Washington work is tied to the same employer. |
| Are you fully Washington-licensed? | Limited interstate authority is not the same thing as full Washington licensure. | If the answer is no, the investigator should say that plainly instead of blurring a limited allowance into a Washington license. |
Two Paths Readers Should Not Confuse
Up to Ninety Days on a Temporary Assignment
Washington separately recognizes a temporary-assignment path that can run up to ninety days, but it is narrower than generic nationwide marketing suggests.
Same Employer Structure Matters
For the temporary-assignment path, the same-employer relationship is part of what makes the limited Washington activity fit the rule.
Neither Path Equals Open-Ended Washington Practice
Limited recognition for a specific window or assignment is not the same thing as being broadly Washington-licensed.
What an Out-of-State PI May Not Claim
Nationwide Marketing Is Not Enough
Saying we work everywhere does not answer the actual Washington-authority question.
Temporary Assignment Is Not Open Solicitation
A temporary assignment does not turn limited Washington activity into broad, indefinite Washington marketing authority.
Limited Authority Should Not Be Blurred Into Full Washington Licensure
If the PI is not Washington-licensed, the explanation should stay precise and honest about that fact.
Vague Answers Are Their Own Warning Sign
If the investigator cannot explain which Washington rule they are relying on, the client should slow down before interstate work starts.
Family-Law Situations Where This Question Actually Matters
Relocation Disputes
State-line moves often create confusion about whether the factual work should happen in Washington, outside Washington, or both.
Interstate Parenting-Time Verification
The case may involve exchanges, residence use, or caregiving facts that straddle more than one state.
Locate and Residence Questions
An out-of-state PI may be relevant when the factual problem involves movement, current residence, or concealment concerns beyond Washington.
Cross-State Surveillance or Corroboration
Some family-law files need evidence from both sides of a state line, which is exactly where authority and assignment structure need to be clear.
Questions To Ask Before Interstate Work Starts
What Exact Washington Authority Are You Relying On?
A competent answer should identify the rule, not just the brand's footprint.
Where Are You Registered or Certified Already?
The investigator should be able to explain their home-state status and why it matters to the Washington analysis.
How Long Will the Washington Assignment Run?
Time limits matter under both pathways, so the assignment window should not stay fuzzy.
What Work Happens in Washington Versus Somewhere Else?
The cleaner the cross-state scope, the less likely the client is paying for legal ambiguity and operational drift.
Red Flags in Multi-State PI Marketing
We Work Anywhere
That phrase is not enough if nobody can explain the actual Washington authority behind it.
No Clear Washington Explanation
If the PI talks only about experience and never about the rule they are using, the answer is not clear enough.
Vague Employer or Assignment Structure
Temporary-assignment authority is not just a vibes-based concept. Structure matters.
Claims Bigger Than the Limited Authority
The broader the marketing claim, the more important it is to ask whether the actual legal pathway is much narrower.
Out-of-State PI FAQ
Does nationwide marketing mean the PI can legally work in Washington?
No. Marketing reach and Washington authority are different questions. The investigator should be able to explain the specific Washington rule they are relying on.
Is temporary assignment the same as being licensed in Washington?
No. A temporary-assignment path is limited and assignment-specific. It is not the same thing as broad Washington licensure.
Can an attorney just hire any out-of-state PI for a Washington matter?
Not safely as a default assumption. The attorney still needs to know what authority the investigator is relying on and whether the scope fits that rule.
When is a Washington-based investigator the safer choice?
Usually when the work is materially Washington-centered, likely to last, or likely to get messy enough that limited interstate authority adds more ambiguity than value.
Need help deciding whether a Washington-based PI or a limited out-of-state assignment is the safer fit?
If the case crosses state lines, the first step is planning lawful authority and the actual factual gap before retainers move in the wrong direction.