"Putting drug dealers in jail", to only very loosely paraphrase her words. She was working with the prosecutors.

The news loves to call her a "rogue chemist" to misdirect.

http://www.boston.com/news/local/massachusetts/2012/12/20/in...

I can only speculate about her motives. But the system that is set in such a way that prisons can be privately owned and prisoners exploited for personal gain is a recipe for disaster. Stakeholders making profit from prisoners have a strong incentive to somehow ensure that as many people as possible get sent to prison for as long as possible no matter whether they are guilty or not. Some might decide to achieve this by bribing someone in the chain of obtaining/evaluating evidence. In a penal system like this it's just a matter of time before something like this happens.

BTW, it might also be a nice way to explain why punishments tend to be so much harsher than for example in Europe - in the US can being 'tough on crime' be profitable.