In a subsequent investigation in 2012, the DOJ found that evidence related to hair analysis had been falsified, altered, or suppressed, or that FBI agents had overstated the scientific basis of their testimony, to the detriment of defendants. In 2013, the Department of Justice began a review of cases referred to them for hair analysis from 1982 through 1999, as many as 10,000 cases, to determine whether their agents' testimony resulted in wrongful convictions. DNA testing has revealed some convicted inmates to be innocent of violent crime charges against them. In 2015 the FBI reported that their expert witnesses overstated the reliability of hair analysis in matching suspects 96 percent of the time, likely influencing conviction of some defendants.