Fortunately for the victims and investigators, the bombs were crudely made, did not explode and contain a treasure trove of valuable information that can be used to track down the culprit. “There’s DNA that can be recovered from the device,” Ryan Morris, founder of Tripwire Operation Group, a company that provides explosives training to law enforcement and military officials, told Fox News. Morris said that investigators will likely be able to take DNA from the fingerprints found on the tape as well as the saliva from the postage stamps. Each package that was sent had six postage stamps attacked. Experts will...