Naw, or at least I doubt it. Why bother? The stuff is easy to grow and everyone knows how deadly it is. The difficulty with bacterial toxins is that they tend to be fairly large proteins, and hence degrade pretty rapidly in the field. Throwing the stuff in a reservoir, for example, sounds like a perfect terrorist ploy but in practice the toxin doesn't stay toxic very long. A little sunlight, a little chlorine, and that's pretty much the end of the story.
It wouldn't be bad as an assassination weapon under controlled circumstances, though. But I don't think this was that. Could be wrong, of course.