Police powers - direct dot point in the CRIMINAL INVESTIGATION PROCESS......... unless you spoke of young offenders and the discretion in there..... but even then young offenders shouldn't have been the main point just a side note (cause it specifically said Sentencing and Punishment, not in the justice system with a discussion on S&P )Police powers - Discretion in providing punishments (Cautions, warnings fines etc)
Director of Public Prosecutions - Discretion to pursue cases base on success, resources, public interest etc
Based evaluations on balancing rights of victims, offenders society, issues of compliance/non-compliance, achievement of just outcomes, resource efficiency etc.