The CPS job is to prosecute criminal cases investigated by the police. As part of this role they make the decisions about what charges will be put to an accused. The CPS does not investigate crime. They must review every case referred by the police, or other investigators. They provide early legal advice in investigations to help build cases and to identify whether or not an accused should be charged.
The 5 key features are: the ‘burden’ of proof, the standard of proof, what has to be proved, how to gather the evidence and who will decide your case.
There are two kinds of burden of proof. The legal burden (sometimes called the persuasive burden) which falls on the person or party that has to prove their case. The evidential burden is the task of producing the evidence to prove the case.