Every interpreter credential worth relying on is checkable against a public roster, usually in under five minutes. Verification matters because the consequence of an unverified claim lands on the proceeding, not the interpreter: testimony taken through an unqualified interpreter invites objection, exclusion, or a repeat performance. And the claims are not interchangeable. Certified, registered, qualified, and credentialed describe different tiers issued by different bodies, and a scheduling email that uses them loosely is exactly the situation verification exists for. The walkthrough below covers each roster in the order you are likely to need it, with the statutory basis for each one.
Get the exact credential and jurisdiction in writing
Start by asking the interpreter or agency for three things in writing: the interpreter's full name as it appears on the credential, the exact credential tier, and the issuing jurisdiction or body. Vague answers like "court qualified" or "fully certified" are not credentials; they are adjectives. The distinctions between tiers are explained in what is a certified court interpreter.
Check the California court roster
For California court and deposition work, the Judicial Council publishes the Master List of certified court and registered interpreters, searchable through the Language Access Services site. Inclusion means the interpreter passed the required exams, enrolled with the Judicial Council, paid all applicable fees, and satisfied continuing education requirements, so the list doubles as a good-standing check rather than a historical record. Government Code sections 68561 and 68562 govern certification and registration for spoken languages; interpreters for the Deaf or hard of hearing are governed separately under Evidence Code section 754.
Which tier applies depends entirely on the language. California certifies spoken language interpreters by examination in twelve languages: Arabic, Cantonese, Eastern Armenian, Farsi (Persian), Filipino (Tagalog), Korean, Mandarin, Portuguese, Punjabi (India), Russian, Spanish, and Vietnamese. Every other spoken language runs through the registered tier, which has its own examination and its own enrollment. A registered interpreter in a language with no certification exam is not a lesser credential; it is the only credential that exists for that language, and reading it as a shortfall is a common and expensive mistake. Effective January 1, 2025, Japanese, Khmer, and Western Armenian became registered languages, so a roster search for those three has to be run under registered rather than certified. Details of the California program are in the California Court Interpreter Program explained, and other states' equivalents are cataloged in the state court interpreter certification guide.
Check the federal categories, which do not mirror the states
Federal court certification is separate from state certification, and the federal system is narrower than most people expect. The Administrative Office developed certification programs for three languages, and two of them are closed: the Navajo and Haitian Creole examinations are no longer offered, which leaves the Federal Court Interpreter Certification Examination running for Spanish and English only. A claim of federal certification in any other language is either a different credential or a mistake.
For every language without a federal certification exam, the Administrative Office recognizes two further categories: professionally qualified and language skilled. Professionally qualified is the one you can actually verify against documentation, because it requires evidence of one of the following:
- Passing the U.S. Department of State conference or seminar interpreter test in a language pair that includes English. The State Department escort interpreter test is expressly not accepted, and it is the substitution most likely to be offered in its place.
- Passing the interpreter test of the United Nations in a language pair that includes English.
- Passing the full version of the oral certification examination developed by the National Center for State Courts.
- Current membership in good standing of the Association Internationale des Interprètes de Conférence (AIIC) or The American Association of Language Specialists (TAALS).
There is no public federal roster equivalent to a state list. Under the Court Interpreters Act, 28 U.S.C. section 1827(c)(1), each United States district court maintains the list of certified interpreters on file in the office of the clerk, so verifying a federal credential means asking the clerk or the court's interpreter coordinator rather than running a web search. The differences are covered in federal court interpreter certification explained.
Check the medical registries
Medical interpreter credentials have their own certifying bodies, and both publish a public registry. CCHI offers three credentials: the Core Certification Healthcare Interpreter (CoreCHI), the CoreCHI-Performance (CoreCHI-P), and the Certified Healthcare Interpreter (CHI). CCHI began sunsetting the CoreCHI credential on January 1, 2025, so a current CoreCHI holder has to pass the performance exam and move to CoreCHI-P in order to stay certified. Verification runs through CCHI's National Healthcare Interpreter Registry.
The National Board of Certification for Medical Interpreters runs two programs. The Certified Medical Interpreter (CMI) credential requires a written and an oral examination and exists in six languages: Spanish, Russian, Korean, Vietnamese, Cantonese, and Mandarin. For every other language the National Board offers the Hub-CMI, which is the written examination alone, because no oral examination exists in that language. A Hub-CMI is a real credential and is not the same thing as a CMI, so a confirmation that says "nationally certified" without naming which one has told you nothing. The comparison is in CCHI vs. NBCMI.
Check RID for sign language credentials
For American Sign Language, the Registry of Interpreters for the Deaf maintains a public, real-time searchable registry of members and their certifications. RID currently offers two national certifications, the National Interpreter Certification (NIC) and the Certified Deaf Interpreter (CDI), but many working interpreters hold legacy certifications that RID no longer issues and still recognizes, so an unfamiliar acronym is not by itself a red flag. Run the name through the registry rather than judging the acronym. Legal and medical ASL work should be staffed by RID-certified interpreters, and some situations call for a Certified Deaf Interpreter working in tandem, as described in when a Certified Deaf Interpreter is needed.
Check the date, not just the name
A credential that was real in 2021 can be lapsed today, and a name on a certificate does not tell you which. CCHI credentials are valid for four years from the date CCHI issued them, a period written into California regulation as well as CCHI's own rules, and the holder has to complete recertification inside that window. California court interpreters renew annually and must meet continuing education requirements to stay on the Master List. That is the practical argument for checking the roster rather than accepting a certificate by email: the certificate records what happened once, and the roster records what is true now. When a credential matters to a proceeding, verify it close to the proceeding rather than at the time of the first booking.
Apply the workers' compensation standard
California workers' compensation uses its own definitions, and it splits them across two regulations that are easy to conflate. For hearings, depositions, and arbitrations, 8 CCR section 9795.1.5 requires that a paid interpreter be certified, meaning listed on the state personnel listing now served by CalHR or on the California Courts listing. The same section recognizes a provisionally certified interpreter when a certified one cannot be present, either by agreement of the parties or on a finding by the workers' compensation judge or the arbitrator, and that finding and its basis have to be set out in the record of the proceedings.
Medical appointments run under a different section. 8 CCR section 9795.1.6 covers medical treatment appointments and medical-legal exams, and it is that section, not 9795.1.5, that recognizes CCHI and National Board credentials alongside the two state listings. If you are verifying an interpreter for an IME or an AME, 9795.1.6 is the section to cite. The fee schedule and credential rules are detailed in workers' comp interpreter credentials and fees.
Confirm it on the record
Verification ends where the transcript begins. In a California deposition where no judge is present, Government Code section 68561(h) requires the certified or registered interpreter to state three things on the record: their qualifications, including name and certification or registration number; that the interpreter's oath was administered or is on file with the court; and that they have presented to both parties the certification or registration badge issued by the Judicial Council, or other documentation verifying the credential, accompanied by photo identification. The third item is the one most often skipped, and it is the one that turns your verification into something the transcript carries. What the statement must contain, and what to do when it is missing, is covered in what a deposition interpreter must state on the record.
When verification fails, substitute before the proceeding, not after the objection. A replacement booked two days early is an inconvenience; an interpreter successfully challenged mid-deposition is a continuance, a second appearance fee, and sometimes a fight over the testimony already taken. AMS confirms every interpreter by name and credential in writing at booking, so the verification step is done before you receive the confirmation.