When the NZ cops first tried to get their sticky fingers on the CVR data there was a spate of mysterious failures in cvr systems (the breakers seemed to pop quite often, rendering the system inop). When the new law was passed it seems the system reliability improved immeasurably.
Are we now at risk, again, of that (quite common) feature of NZ life - the overzealous cop stitchup?
It may be that the MBTF of cvr systems is set to decrease again.