Quite recently, the researchers behind the Tetraburst attack (https://www.tetraburst.com/ https://www.tetraburst.com/) discovered that Tetra's encryption has "l

Quite recently, the researchers behind the Tetraburst attack (https://www.tetraburst.com/ https://www.tetraburst.com/) discovered that Tetra's encryption has "levels" which depend on the intended recipient's country. This leaves the critical infrastructure of emergency services and police force for a lot of countries (notably, US non-allies) wide open to attack.