HOUSTON, May 2 — Faulty evidence masquerading as science sent two men to death row for arson in Texas and led to the execution of one of them, a panel of private fire investigators concluded in a report released Tuesday in Austin.

The report, prepared for the Innocence Project, a legal clinic dedicated to overturning wrongful convictions, was presented to a new state panel, the Texas Forensic Science Commission, created by the Legislature last year to oversee the integrity of crime laboratories.

Barry C. Scheck, a co-director of the Innocence Project, said the report offered "important evidence of serious scientific negligence or misconduct in the investigations, reports and testimony of Texas state fire marshals" and called into question not just the two cases but also many others based on similar arson analyses.

The nine-member forensic panel, late to start up and as yet unfinanced, "will review it and investigate," said its chairwoman, Debbie Lynn Benningfield, a fingerprint expert and retired deputy administrator of the Houston Police Department's latent laboratory section.