How afraid should we be regarding terrorists using WMD's against innocent civilians? How likely is it that terrorists will use biological, chemical, or nuclear/radiological weapons against civilians? I've read that these guys are, by and large, educated in the relevant fields and can easily get their hands on or build their own WMD's. For example, I've read reports indicating that they can or already have gotten their hands on multiple Soviet-era suitcase nukes, and that they can get even larger ones if they wanted. So how worried should we be? I mean, can we trust the intelligence community to protect us?