Botulinum toxins are the most toxic substances known, and thus a potentially devastating weapon if efficiently dispersed [1] . The lethal dose of botulinum toxin for a 70 kg human is estimated to be 0.7 to 0.9 μg inhaled or 70 μg ingested [78] . Enough toxin is present in a single gram of crystallized botulinum toxin to kill more than 1 million people [14] . It is 15,000 times more lethal than the highly potent chemical agent VX and 100,000 times more lethal than sarin [8] .