The number of prosecutions in England and Wales that collapsed because of a failure by police or prosecutors to disclose evidence increased by 70% in the last two years, the BBC can reveal.
Last year, 916 people had charges dropped over a failure to disclose evidence - up from 537 in 2014-15.
It comes after recent collapsed rape cases highlighted a failure to share evidence with defence solicitors.
The Crown Prosecution Service said the justice system had "systemic" problems.
This is a disgusting state of affairs and one has to wonder how many men are in prison having been convicted of crimes they didn't commit because the prosecutors and police have withheld evidence. It's time these people realised that they are there to prosecute and convict the guilty, not condemn the innocent to make the unsolved crime figures look better.
A full investigation into each of these cases should be carried out and the police officers and prosecutors involved brought to account.