Well not giving you ideas but voice signatures or prints are used in the wild, in wars or even civil cases, even in the US https://www.technologyreview.com/2019

Well not giving you ideas but voice signatures or prints are used in the wild, in wars or even civil cases, even in the US https://www.technologyreview.com/2019/01/31/137633/us-prisons-are-building-biometric-databases-of-their-inmates-voices/ https://www.technologyreview.com/2019/01/31/137633/us-prison...