The Innocence Project, a non-profit legal group dedicated to using DNA testing to overturn verdicts for those wrongly convicted of serious crimes, says they have the evidence to prove that Karl Vinson, a Michigan man convicted of rape who has spent the last 23 years in prison, is innocent. The Detroit Free Press reports:

The Innocence Project at the University of Michigan Law School, in a motion filed Monday in Wayne County Circuit Court, said it has new scientific evidence that Vinson was not the man who crawled through a window in 1986 to rape a 9-year-old Detroit girl in her bed.

Vinson’s innocence is “a slam dunk … a scientific certainty,” said David Moran, a U-M law professor who heads the project, which works to overturn wrongful verdicts…

The testing “conclusively shows that Mr. Vinson is an AB secretor, contradicting prosecution witness testimony and evidence used against Mr. Vinson at trial,” the project said in its legal filing.

The project said the new tests indicates the attacker was also a secretor, but with blood type O semen.

Wayne County Prosecutor Kym Worthy has received the Innocence Project’s report but says that the evidence in this case is “not clear-cut.” A hearing is required for a judge to examine the evidence and decide what to do. That hearing has not yet been scheduled.

The Innocence Project has successfully proven the innocence of 242 people convicted of major crimes they did not commit, including three from the state of Michigan.