(a) In prosecutions under s. 940.01, the state fails to prove beyond a reasonable doubt that the mitigating circumstances specified in s. 940.01 (2) did not exist as required by s. 940.01 (3); or
940.05(1)(b)
(b) The state concedes that it is unable to prove beyond a reasonable doubt that the mitigating circumstances specified in s. 940.01 (2) did not exist. By charging under this section, the state so concedes.