You forgot to mention why the charges were dropped:
> The judge declared a mistrial in December and ruled on Monday that prosecutors could not retry the case, arguing that the US attorney’s office had willfully withheld evidence and engaged in misconduct.
Somehow I don't think such consideration would have been extended to the Boston bombers, even with LE overreach on display for the whole country to see re: the search and entry tactics in Watertown et al.
> The judge declared a mistrial in December and ruled on Monday that prosecutors could not retry the case, arguing that the US attorney’s office had willfully withheld evidence and engaged in misconduct.