Believe an audio recording has been edited?

Having the audio authenticated will give you a definitive answer.

Audio authentication by a forensic audio expert can detect edits made to audio recordings including changing the date a recording was captured or removing words or sentences. The combination of  a proliferation of audio recording devices and simple to use editing software has led to a rise in manipulated audio in criminal, civil and private affairs.

We can detect if an audio recordings has been manipulated, regardless of the format. If it's MP3, WAV, WMA or M4a, we apply techniques such as Double Quantization compression, butt-splicing and ENF comparisons. There are so many techniques at our disposal that the odds of getting an edited audio recording past us are incredibly low.

For more information on the ENF technique please click here to read James Zjalic's Audio Engineering Society research paper "A Low-cost, cloud-based, portable ENF device" and the Forensic Focus article "The future of ENF systems".