That's how it's always worked. The cops only charge someone if they believe that they have a case and can get a conviction. No point having a court case if even the police do not think they have a reasonable chance of winning.Oh Really?
So if someone is charged, a jury decides. But before that we have one copper make the call, nice. Looks like someone decided that Scott Moller needed some assistance, who knows, maybe he has form.
Lack of evidence does not mean that a crime was not commited. It means that the person who did it does not get convicted.
In the end though, half the jury thought he was guilty!
Obviously the DPP can still proceed with the case if he disagrees with the police assessment or if there is pressure from above.