The headline is wrong. It's not that the feds "dropped" charges. 
The Feds FALSELY charged an innocent man because he was Chinese - and didn't even have experts review the "evidence" before making the charges. #shameful  

http://www.nytimes.com/2015/09/12/us/politics/us-drops-charges-that-professor-shared-technology-with-china.html?_r=0
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