Many violent and sexual offenders are mentally disordered or will develop mental disorders while serving their sentence. The Criminal Justice Act 2003 introduced major changes to the sentencing of 'dangerous offenders'. The disposal given to these offenders has implications for subsequent clinical management in secure mental health units, prison and, ultimately, in the community, particularly when it is an indeterminate sentence. This paper argues that the Act also has implications for psychiatric evidence submitted to the courts in such cases. The changes appear to carry significant resource implications too, especially for community forensic psychiatry.