Review conducted on 268 trials suggest 95 per cent were affected
Of those impact, 32 were sentence to death - 14 have since died

The FBI and Justice Department have admitted forensic examiners from a DNA unit gave flawed evidence at nearly all United States criminal trials spanning 20 years.

It has been reported that 26 employees in the agency's microscopic hair comparison laboratory overstated forensic matches so they favored prosecutors in the 1980s and 1990s.

Research involving the National Association of Criminal Defense Lawyers (NACDL) and the Innocence Project say that 95 per cent of 268 trials reviewed had been impacted.