I found a couple of solid articles on the Biological and Toxic Weapons Convention (BTWC). The first addresses some efforts made during the Clinton administration to increase its efficacy (which is about null at present) by involving America in it. The concerns of the Bush administration as expressed in the article are quite legitimate and difficult to assuage--the turning point in such attitudes will probably not come until attacks begin because risks of biowar are virtually unquantifiable in the pre-attack world (which means the statistically ignorant will tend to ignore such risks), whereas the economic and military risks of the inspection regime are clear enough and probably huge. http://www.csmonitor.com/2001/0824/p11s3-coop.html
The second article is a little more tendentious in tone with an overtly anti-American bias, but it covers some significant secondary issues and gives a better sense of the perspectives of other nations on the appeal of the Convention. It also provides a useful reminder of the diversity of potential targets for bioweapons--agricultural production and livestock among them. However, it largely skirts the main threats, those to human health. http://www.organicconsumers.org/patent/biowar100501.cfm