It is a fact that today voice recognition has become a significant issue.
For example:
In France, the famous case of the Jérôme Cahuzac affair recognized by the BATVOX software clearly shows the critical issue of voice protection.
We specify here that several legal obligations in the world cover the protection of witnesses as an indication and are not exhaustive:
- In the United States, in the 1970s, the anonymization of witnesses became mandatory as a result of the program to dismantle mafia-type criminal organizations
https://www.unodc.org/documents/organized-crime/09-80620_F_ebook.pdf
- In 2001, France strengthened witness protection with the law N° 2001-539, article706-61.
http://prison.eu.org/livret-4-titre-21-de-la-protection
The full set of global recommendations can be found in the 2009 UN report, pages 8-16:
https://www.unodc.org/documents/organized-crime/09-80620_F_ebook.pdf