there was the news that female dna was found on one of the explosive devices. what do you think is going on? the fbi wants to be able to ask her a number of questions and verify much of the information that has been provided from other aspects of the investigation and from what statements she has made. under her rights she does not have to talk to the fbi not one word. they cannot compel her to talk. they can issue subpoenas for dna samples or do other investigative activities with her. she is not obligated to talk in any way. she is obligated if she does talk that it be the truth. she would be charged with with lying to the fbi in an official investigation. she doesn t have to. that is a big part of this is whether the physical evidence and other aspects of the investigation link her to a bigger involvement or greater knowledge of what tamerlan may have been up to during the time that they were together.