The frontline of a modern criminal justice system is increasingly preoccupied with anticipating threats, and is the antithesis of the traditional criminal justice system's focus on past crimes.[12] Traditionally, criminal justice and punishment presuppose evidence of a crime being committed. This time-honored principle is violated once punishment is meted out "for crimes never committed".[13] Today, a clear example of this trend is "nachträgliche Sicherungsverwahrung" (retrospective security detention), which became an option in German criminal law in 2004. This "measure of security" can be decided upon at the end of a prison sentence on a purely prognostic basis.[14] In France, a similarly retrospective measure was introduced in 2008 as "rétention de sûreté" (security detention).