Forensic Audio Extraction
As audio is such a volatile format that can become inadmissible evidence if handled incorrectly, it is vital that the first link in the chain of custody is performed correctly. If done incorrectly, extracting the audio from a device can change vital information within the metadata and thus cause the audio recording to become non-original, opening the possibilities of its authenticity to become challenged later down the line. For these reasons it is best to have a forensic expert perform the acquisition of evidence.
We use forensic tools such as write blockers (to prevent any data been written to the device) and forensic bit-stream software (to ensure a bit for bit copy is created) to extract audio from mobile phones, portable audio recorders and hard drives.