61.   But biological weapons disseminating the dry, odorless, tasteless anthrax spores can kill a victim in just days.

62.   But he and other experts say that white supremacists, among others on the radical right, have shown an interest in biological weapons.

63.   But it also expressed anxiety about the ozone layer and biological weapons.

64.   But producing biological weapons is one thing.

65.   But some top scientists and others who have studied biological weapons are not nearly as optimistic.

66.   But some diplomats and officials say they are concerned that Iraq may still have biological weapons stored at secret sites.

67.   But picking up biological weapons are apparently a much trickier task.

68.   But the system can detect only chemical toxins, not biological weapons like anthrax and smallpox.

69.   But the very psychological potency of biological weapons may blur a cool assessment of the real threat they contain.

70.   But the biological weapons treaty does not contain a means of verifying compliance.