The trial begins, only to collapse after a week due to police failures. Can a fair trial ever happen?

The trial begins.

A week later, it's declared a mistrial. The Crown has just turned over evidence that seems to say someone saw the murder of Brett Hall - and the killer wasn't David Lyttle!

How could that possibly happen? It turns out that this is just the latest in an astonishing chain of disclosure failures by police investigating the case.

Is the justice system broken? Can a fair trial go ahead?

Go to this episode on rnz.co.nz for more details