There are wide variations in procedures in different jurisdictions.
In England & Wales, for example, police officers do not need warrants to arrest suspects, and there are strict time limits between a defendant being charged and appearing in court. We don't have protracted jury selection procedures. Judges are not involved in deliberations with prosecutors or defenders before trial. The normal procedure (if the job is done right) is that the victim tells their story once (recorded) and is not available for interview by the defence. Then the support can start right away. Also in E&W there are very strict rules on media reporting before and while the trial is ongoing. We don't have prosecutors giving press interviews (they are not elected).