Some links on questions on the Boston Bombing by others. There is a good chance that there will be no effective defense, and this may be because Dzhokhar Tsarnaev was involved and he wants to take credit for his role. He may also wish to shield others.
Simulations of a model wearing a backpack with a 30 pound load shows stress wrinkles in the jackets that are not present in the photos of the Tsarnaevs before the bombing.
In the event that Dzhokhar Tsarnaev wants to take credit for the crime, the government still has some explaining to do as to how it was done and how the NSA missed what was happening from the time of Berezovsky’s death to the Boston Bombing. They also should have been monitoring Chechens in Boston because of their blaming IMF loans for funding their genocide.
This is draft and preliminary. The above is hypotheses and speculation. Comments and corrections welcome. Please restate as questions. All other disclaimers apply.