The obvious question

Te Kāhui / Criminal Cases Review Commission has found another potential miscarriage of justice, where police appear to have coached a witness in an indecent assault case, making their evidence unsafe, and then covered it up. So its been sent back to court for a re-hearing, which is appropriate. That's bad enough, but the Post version of the story is even worse:

A police officer influenced a victim into identifying a suspect, then officers deliberately hid what had happened from judges and courts, a wrongful conviction body has found.

And when investigators discovered what they’d done, police officers lied to them while under oath, according to the Criminal Cases Review Commission (CCRC).

Which raises an obvious question: will those officers be charged with conspiring to defeat justice (for the original offence) and perjury (for lying to Te Kāhui)? And if not, why not? Because if police are allowed to outright lie to judicial bodies, why should we or the courts believe anything they say ever again?