U.S. v. BUTLER

No. 17-3080.

955 F.3d 1052 (2020)

UNITED STATES of America, Appellee v. Dennis T. BUTLER, Appellant.

United States Court of Appeals, District of Columbia Circuit.

Decided April 14, 2020.


Attorney(s) appearing for the Case

Jenna M. Cobb argued the cause for appellant. With her on the briefs were Jonathan W. Anderson and Adam G. Thompson.

Patricia A. Heffernan , Assistant U.S. Attorney, argued the cause for appellee. With her on the brief were Jessie K. Liu , U.S. Attorney, and Elizabeth Trosman , John P. Mannarino , and Pamela S. Satterfield , Assistant U.S. Attorneys.

Dissenting opinion filed by Circuit Judge Katsas.


Almost fifty years ago, appellant Dennis Butler was convicted of murder. At his trial, an FBI forensic expert testified that hairs found on the victim were microscopically identical to Butler's hair. The government recently acknowledged, though, that hair evidence of the kind introduced against Butler was false and exceeded...

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