The department may allow an examination of information under par. (c) only if a district attorney petitions a court of record in this state for an order allowing the examination and the court issues an order after finding: 1.
(1)#
There is reasonable cause to believe, based on information believed to be reliable, that a specific criminal act has been committed;
(2)#
There is reason to believe that such information is probative evidence of a matter in issue related to the commission of the criminal act; and
(3)#
The information sought to be examined cannot reasonably be obtained from any other source, unless it is determined that, notwithstanding the reasonable availability of the information from another source, the information constitutes the most probative evidence of a matter in issue relating to the commission of such criminal act.