Here is a much linked New Yorker article about a Texas man named Willingham executed for arson (the fire killed his 3 very young daughters) in 2004 where the current scientific evidence indicates that there is very little evidence that the fire was arson, as opposed to accidental.
The basic gist is that according to the understanding of arson forensics from 1991, the executed guy was guilty. The forensic evidence at the time was very strong that the fire was intentional arson targeted against the baby girls, and that the Defendant's story was a lie, contradicted by the arson evidence.
But, and this is the big but, there has a been a huge change in the scientific understanding of arson since then: specifically a lot of the old theories about arson fires burning hotter are wrong, and a lot of the old theories about what burn patterns indicate is also wrong. The new theories, based on scientific experiments, focus on the concept of "flashover" - once a fire hits the flashover point, there is little difference between accelerant-based fires and accidental fires (the basic difference is that accelerant-caused fires hit the flashover point faster, but the burn patterns left behind, the "spalling" and cracking of materials is pretty similiar.)
By 1991 standards, this case had 20 indications of arson, 19 of which had no innocent explanation, which made it a damn strong case. By current scientific standards, all 19 of those indications don't hold up, and the one indication left (residue of lighter fluid on the porch area) has an innocent explanation: the family had a Barbecue on the porch, and kept a can of lighter fluid there, which is shown in pictures from shortly before the fire. So by modern standards, there is basically no substantial evidence of arson.
Interestingly, there is another Texan, named Willis, who was convicted of a very similiar crime and has now been exonerated based on the same scientific changes. Willis has been released and paid $430,000 by the state for wrongful incarceration (by Texas standards, thats a buttload). Even more interestingly, Willis was actually a cellmate of Willingham on Death Row. The difference between the two? The scientific evidence on Willis managed to get itself in front of a judge before they executed him. Whereas in the case of the unfortunate Mr. Willingham, the new scientific evidence was produced mere days before his execution and it sadly looks like nobody really took a good look at it.
I am not a rabid anti-death penalty person and I feel no sympathy for the brutal murderers who mostly occupy Death Row. But this case makes a very strong point: human knowledge is fallible. According to the science of 1991, the guy was guilty and thus was executed. We now know that was incorrect, and if he was serving a life sentence we could let him out. But because we killed him, there is no way to correct our mistake.
I hope this case gets a lot of attention. Read the whole article, which is quite good. If you doubt the science, google around abit for "arson science" and "arson forensics" and you will see a lot about the sea change that has happened in the last 15 to 20 years.
I have no dog in this fight: when I read the early part of the article where the science seemed to show conclusively that Willingham was a lying arsonist, I felt his conviction for arson was justified. But when you read the later science stuff, the whole case changes dramatically. We humans are fallible. Too fallible, IMO, for capital punishment to make sense.


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