What is a CAD log, and how does it relate to a 911 call transcript?

A CAD (computer-aided dispatch) log is the timestamped record dispatchers create as a call unfolds — units assigned, status changes, key facts entered. It's a structured summary created in real time, not a verbatim transcript of what was said. In litigation or an internal review, the CAD log and the actual call transcript are often compared against each other, since discrepancies between what was said and what was logged can matter.

Why is 911 audio harder to transcribe accurately than a typical recorded call?

911 audio combines several problems at once: callers who are panicked, injured, or speaking with background chaos; radio traffic with compression and clipped transmissions; multiple simultaneous speakers (caller, call-taker, dispatcher, responding units); and frequent use of codes, addresses, and jargon. Each of these independently increases word error rate, and 911 audio usually has several of them together.

Guide

Transcribing 911 calls and dispatch communications: public safety's records burden

Q: Are 911 calls public record?

In most states, yes — 911 call recordings are generally subject to public-records law and can be requested by anyone, including reporters and litigants, though some states allow redaction or withholding of certain content (such as a caller's or victim's identifying details, or an active-investigation exemption) and a few restrict release more broadly. The default assumption in most jurisdictions is disclosure, not confidentiality.

Q: Can AI transcription keep up with a 911 records request?

It can substantially reduce the backlog. Records units that receive frequent requests for 911 and dispatch audio spend much of that time manually reviewing recordings to identify the relevant portion and redact exempt content. A searchable, time-stamped transcript lets staff find the requested segment quickly, leaving the actual redaction and legal review — the part that still needs a person — as the bottleneck instead of the search itself.

By the exma team · September 23, 2026 · 8 min read

TL;DR: A 911 call is public record in most states, evidence in nearly every serious case it touches, and one of the hardest audio types to transcribe accurately — panicked callers, radio compression, overlapping speakers, and dispatch codes all stack up at once. A searchable transcript turns a records request from a manual re-listen into a text search, which matters most for the understaffed records units that field these requests constantly.

A 911 call is usually a public record

In most states, 911 call recordings are subject to public-records law by default — anyone, including reporters and litigants, can request them, though states differ on what can be redacted (a caller's identity, a victim's identifying details) or withheld during an active investigation. That default of disclosure, not confidentiality, is why dispatch centers and records units field 911-audio requests routinely, not as a rare exception. It's the same public-records logic covered for government meetings in transcribing public meetings and records requests, applied to a much higher-volume, more time-sensitive record.

Evidence in nearly every case that follows

Beyond records requests, a 911 call is frequently the first piece of evidence in a criminal case, a civil suit over police or EMS response time, or an internal review of how a call was handled. What the caller said, when they said it, and how the call-taker responded are all facts that a transcript preserves precisely — which is exactly the kind of record that later gets compared word-for-word against testimony, much like the body-cam footage covered in transcribing body-cam footage and police interviews.

CAD logs vs. the actual call transcript

Every 911 call generates a CAD (computer-aided dispatch) log — a timestamped, structured record a dispatcher builds in real time: units assigned, status updates, key facts entered as fields. It's fast and standardized, but it's a summary of what the dispatcher typed, not a verbatim record of what was said. In litigation or an internal affairs review, the CAD log and a full transcript of the actual audio often get compared side by side — a gap between what was said and what got logged can matter a great deal, and only the transcript can show it.

Why 911 audio is some of the hardest audio to transcribe

What stacks up in a typical 911 or dispatch recording
Factor	Why it hurts accuracy
Caller distress	Panicked, injured, or crying callers produce atypical speech patterns
Radio compression	Narrowband transmissions strip frequency detail, clip word edges
Overlapping speakers	Caller, call-taker, dispatcher, and responding units can all be on the line or channel
Background chaos	Traffic, sirens, crowd noise at the scene compete with the caller's voice
Codes and jargon	10-codes, unit numbers, and department-specific terms aren't in general vocabulary

Most of these compound rather than average out — a distressed caller on a bad phone connection, overlapping with a dispatcher relaying to a responding unit, is a substantially harder transcription problem than any one of those factors alone.

Where the records burden actually sits

Dispatch and records units are usually understaffed relative to their request volume, and the bottleneck is rarely finding the recording — it's finding the relevant portion of it and handling redaction correctly before release. A searchable, time-stamped transcript turns "find the part where the caller gave the address" from a manual re-listen into a text search, freeing staff time for the parts of the job that genuinely need a person: legal review, redaction of exempt content, and judgment calls on what a specific state's public-records exemptions actually cover.

Same lesson as body-cam: AI-assisted transcription doesn't replace the review step — it removes the bottleneck in front of it, so the review step is what's left standing between a request and a response.

Frequently asked questions

Are 911 calls public record?

In most states, yes — subject to possible redaction of identifying details or an active-investigation exemption. The default is disclosure, not confidentiality.

What is a CAD log, and how does it relate to a call transcript?

A timestamped, structured summary a dispatcher builds in real time — not a verbatim record. It's often compared against the actual call transcript in litigation or review.

Why is 911 audio harder to transcribe than a typical call?

Panicked callers, radio compression, overlapping speakers, background chaos, and codes or jargon frequently combine in the same recording, each independently raising error rate.

Can AI transcription keep up with a 911 records request?

It substantially reduces the backlog by making audio searchable, leaving redaction and legal review — not the search itself — as the bottleneck.

This article is general information, not legal advice. Public-records exemptions, redaction requirements, and evidentiary rules for 911 and dispatch audio vary by state and agency — consult your records officer or counsel for a specific request or case.

Transcription built for the dispatch record

exma turns 911 and dispatch audio into a searchable, time-stamped transcript with encryption in transit and at rest, so records requests move faster without adding staff. Try it in your browser.

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