(quote)
Reasonable prospect of conviction
4.
A prosecution may only proceed if there is a reasonable prospect of a conviction. In
determining whether there is a reasonable prospect of a conviction, regard must be had to:
•
all the admissible evidence
•
the possibility of evidence being excluded
•
any possible defence
•
whether the prosecution witnesses are availa
ble, competent and compellable
•
the credibility and reliability of the prosecution witnesses
•
any substantive conflict between eye
-witnesses
•
whether there is any reason to suspect that evidence may have been concocted
•
how the witnesses are likely to stand up
to giving evidence in court
•
any possible contamination of evidence
•
the reliability of any admissions
•
the reliability of any forensic or medical evidence
http://www.opp.vic.gov.au/getattachment/b5d48af4-3bef-4650-84fa-6b9befc776e0/DPP-Policy.aspx