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Spot on. It's outrageous that one person was able to cause this much damage, but the sentencing in this case very strongly indicates that there is a perverse system of incentives which allows things like this to happen. As long as someone profits, economically or otherwise, on people being sent to jail, there is an incentive structure which perverts justice. It's shocking to be that there isn't more focus on this problem.

your hypothesis is backed up by this story claiming that at least one other chemist has also been tainting evidence and that 180.000 cases now need to be reviewed.

http://filmingcops.com/breaking-another-government-chemist-a...

Given n>40,000, statistical analysis is one approach.