Renowned forensic scientist Henry Lee is defending work he did three decades ago.
The Connecticut Supreme Court criticized Lee last month when it overturned the convictions of two men for a 1985 murder.
The decision came after experts determined that stains on a towel that Lee had testified were consistent with blood were something else.
Wendall Hasan has been in prison since 1986 for murder. His lawyers filed court papers Tuesday that he should be freed after more recent tests found no blood on a pair of sneakers Lee testified were bloodstained.
Lee responded Thursday at a news conference that his testimony in that case was accurate, as was his testimony in two other cases.
Lee says the blood sample likely was used up during his earlier testing.
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