The amount of testing we can do on forensic recordings is sometimes limited. Where this is so, we may still be able to come to a conclusion, but it could be a weak one – or in some cases, the outcome may be inconclusive.
Things that can limit our testing include:
Recordings that contain little speech are more likely to be insufficient for a full analysis.
Poor Technical Quality
Poor technical quality can affect the types of analyses that are possible.
Noise in recordings can ‘mask’ the speech making it difficult to analyse fully.
Some styles of speech can be less suitable for analysis, such as reading aloud or talking to small children or pets.
Some levels of speech can be less suitable for analysis, such as shouting or whispering.
Speech that is recorded far away from the microphone can be less clear and cannot always be analysed.
Disguised voices cannot always undergo the same analyses as non-disguised speech.
If comparison recordings are mismatched by any of the aforementioned limitations, they could produce a weaker conclusion.