Criminal defense transcription

The discovery asymmetry: the state recorded it, your team has to hear it

Disclosure is not the same as being found: exculpatory material in hour eleven of a bodycam file only helps the client if someone on the defense team reaches hour eleven.

Criminal discovery is lopsided by design. The prosecution and its agencies create the recordings, hold them for months, and review them with investigators and staff. The defense receives the same material as a production, often in batches and often close to a hearing date, and is expected to know what is in it.

Produced is not the same as found

Under Fed. R. Crim. P. 16 and its state equivalents, the defendant's recorded statements are discoverable, and the government's duty under Brady v. Maryland, 373 U.S. 83 (1963), reaches favorable evidence. Neither rule puts a timestamp on the moment that matters. Finding it is the defense team's job, and that job is measured in hours of listening.

Triage by hope

Played in real time, an hour of audio costs an hour of staff time, and defense teams rarely have the staff. A solo practitioner, a two-paralegal office, or a public defender with a full caseload faces the same production a well-resourced prosecution team prepared. The usual response is triage: watch the recordings that look important, skim the rest, and hope nothing material sits in the file nobody opened.

Reading instead of watching

Transcription changes the unit of work. A transcript of an hour-long recording can be scanned in minutes and searched for a name, an address, a time, or a phrase. Sonix returns timestamped, speaker-labeled transcripts in minutes, and multi-file search runs one query across every recording in the production. Every hit links to the exact moment in the audio or video, so checking it is one click, not another full listen.

That is the standard this page is built around: every recording in the production readable, searchable, and checkable before the suppression deadline and before trial. What the evidence means, and what to do with it, stays with defense counsel. Searchable text means counsel gets to exercise that judgment on all of it.

Discovery review: bodycam, interrogations, and 911 audio

The three recordings that decide most suppression and credibility fights read better than they play, because the timestamp settles what came first.

Bodycam and dashcam

A single arrest can produce footage from every responding officer. Sonix transcribes the audio track of each file and labels the speakers, so you read the encounter from several angles and compare them by searching. When one officer's report says a statement came before a search and the audio says after, the timestamp shows it. The full workflow is on the bodycam analysis page. For impaired-driving arrests, DUI defense transcription covers the stop, the field sobriety tests and the license hearing.

Interrogation recordings

Custodial interviews are where defense review is most exact. Speaker labels separate each detective from the client, and your team names them, so the transcript shows what was asked, what was answered, and when. Counsel can locate the moment warnings were given, any request for a lawyer, and where the account shifted, then check each line against the video before drafting a motion under Miranda v. Arizona, 384 U.S. 436 (1966), and the case law of your jurisdiction.

911 and dispatch audio

The first account of an incident is often the 911 call, recorded before anyone had time to settle on a story. A timestamped 911 transcript can be compared with the officers' reports and the timeline alleged in the complaint. See 911 call analysis for the full workflow.

The recordings stay the evidence. Under FRE 1002 the recording itself proves its content, and authentication runs through FRE 901 or your state equivalent. Sonix transcripts organize review; they do not replace the source. Evidence review shows how teams work through a full production.

Know what your client said before the state plays it

Most facilities record nearly every non-privileged call, and prosecutors mine those recordings for admissions and contact with witnesses, so the defense needs to have heard them first.

With weeks of calls in a production, that is a volume problem. Batch-upload the call export and the files process in parallel. Search the transcripts for the names, nicknames, places, and case facts the state is likely to focus on, and flag every call with a hit for a close listen.

Speaker labels separate the two sides of each call, and timestamps let a paralegal jump from a flagged line to the exact second of audio. The result is a defense-side map of the calls before the prosecution builds its exhibit list, including the calls that cut the other way.

The rest of the call

When the state plays a short clip at a hearing, the surrounding recording can matter. FRE 106, the rule of completeness, and its state counterparts give the defense a basis to raise that context, and a searchable transcript of the full call is how counsel finds it fast.

Jail call audio is some of the hardest audio to transcribe. Compressed lines, noise, crosstalk, and slang lower machine accuracy, so treat these transcripts as triage and verify every line that matters against the recording. The full workflow is on the jail call analysis page.

Client interviews, recorded and kept inside the defense

Client meetings in the office, at the jail, or by phone are where the defense theory starts, and a recording is the only account of them that does not fade.

Recording an interview, where your jurisdiction, the facility, and your client allow it, and transcribing it means the alibi witness's name, the timeline of the night, and what the client says the officer said are all searchable alongside the production when discovery arrives.

Privileged material needs controls you can document

ABA Model Rule 1.6(c) asks lawyers to make reasonable efforts to prevent unauthorized disclosure of client information, and ABA Formal Opinion 512 (2024) addresses lawyers' use of generative AI tools, confidentiality included. Sonix is SOC 2 Type 2 audited every year, encrypts files with TLS in transit and AES-256 at rest, never trains AI on your recordings, and restricts each case to the people working it through role-based access and two-factor authentication. On Sonix Legal Enterprise, built-in redaction removes marked words from a transcript and silences the matching audio before a file is shared. Read the Sonix security overview before you upload a client file. These controls support your diligence under your state's rules; they do not replace it.

Motions, impeachment, and trial prep from exact words

A suppression motion that quotes the interrogation by timestamp is easier for a court to follow than one built on recollection, and the quote is a search away.

Motions built on the record

Defense motions run on specifics. Search the transcripts, pull the passage with its speaker and timecode, and export it to DOCX or PDF for the brief. A motion to compel that identifies the gap in a recording by the minute makes the same point without a single adjective.

Impeachment prep

FRE 613 governs examining a witness about a prior statement, and once a government witness testifies, Fed. R. Crim. P. 26.2 and the Jencks Act, 18 U.S.C. § 3500, entitle the defense to that witness's prior statements in federal cases. When those statements are recordings, a searchable transcript lets counsel line up the officer's bodycam account, the report, and the testimony, and cue the clip without scrubbing video at counsel table. Where the quote must be word for word, with false starts and filler, use verbatim transcription.

Case chronologies

Search every recording for dates, times, and events, and your team builds a timeline in which each entry traces back to a recording and a timestamp: a 911 call, a bodycam statement, and a jail call three days later in one sequence. The case chronologies page covers how teams assemble one from the transcripts.

Sonix transcripts remain working drafts for preparation. Where the record requires certification, a certified court reporter or transcriber remains the standard.

Built for public defender caseloads and budgets

The right to counsel recognized in Gideon v. Wainwright, 372 U.S. 335 (1963), is delivered by offices that rarely get a budget increase when the body-worn cameras roll out or the jail starts recording every call.

Per-page outsourced transcription forces rationing: a few recordings get transcribed and the rest get a skim. Sonix pricing is built to end the rationing, because an office pays by the audio hour and nothing else.

Pay as you go at $10 per audio hour with no subscription. Sonix Legal Pro is $880 per year and includes 480 hours of transcription and translation for one user, with additional seats at $275 per year. Sonix Legal Enterprise adds volume pricing, audit logs, SSO, user provisioning, redaction, and matter and folder summaries for offices that need centralized administration. Plan details are on Sonix Legal pricing. Your office's procurement, county IT review, and records-retention rules decide the right setup, and legal sales can walk through them.

Multilingual clients and evidence, one workflow

Many defense clients, witnesses, and recorded calls are not in English, and a recording nobody on the team understands cannot be triaged.

Sonix transcribes 54+ languages and translates transcripts, so English-speaking staff can review a Spanish-language jail call or witness interview and decide whether it matters before paying for certified work. Languages and the workflow are on the Sonix translation page.

Machine translation is a review tool, not a certified translation. In federal court, the Court Interpreters Act, 28 U.S.C. § 1827, governs interpreters in proceedings, and state courts have their own certification rules. Sonix narrows the stack to the recordings worth certifying and gets the defense there sooner.

Related legal solutions

The same discovery looks different from each chair, and Sonix has a page for each of them.

Prosecutors and DA offices

The same productions, reviewed from the other side of the aisle: jail call triage at scale, evidence review, and disclosure that stays with the office.

Transcription for prosecutors

Defense investigators

Field interviews, witness locates, and surveillance audio become searchable text the attorney can quote with a timestamp.

Transcription for investigators

DUI defense

Stop video and station audio, checked line by line against the officer's narrative.

Transcription for DUI defense

Lawyers and solo attorneys

Intake calls, dictation, and depositions for the rest of a solo practice, with the billable-hours math worked out.

Transcription for lawyers

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