If, on the other hand, you are talking about deliberate biological warfare, these sorts of weapons are not very reliable -- especially considering the possibility of them coming back to haunt the user. That doesn't mean nobody would consider developing and/or releasing them, just that it is stupid to do it (but, when we talk about weapons development, my sympathies wane -- an admitted prejudice of mine).
The bottom line is that release of _any_ biological control organism requires very careful and extensive investigation of the potential side-effects. I wish the guidelines were as stingent about the potential side-effects of introducing new crops (that is how nutria, gypsy moths and a whole bunch of weedy plants got to North America -- not to mention skunks to Prince Edward Island [my home]).
BOB
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