The Maranda rights should of course be read to him. If he confesses without being read the rights, his confession could be thrown out of court. they can question him about other bombs and immediate threats to public safety without being read the rights, because the goal at that point is safety. I don't particularly care about any charges of future conspiracy to commit crimes, we can already get him on the marathon bombings (if he indeed did it) and the other crimes. so there's no need to at conspiracy to commit crimes at the risk of public safety. so in short, ask him about any other bombs and things of that nature; we won't be able to use it against him in court, but who cares, public safety should come first. then read him his rights and ask him about the things he's already done, which we then will be able to use in court. if they don't read him his rights at all, they will have to treat his actions as an act of war, which will just make things more complicated and dangerous. what's the point?