Reasons for the use of bioterrorism was varied, and not much different for other weapons systems. A primary reason that they were used is that in general the weapon system was inexpensive, and could wreak havoc on an enemy not only as a result of morbidity, but also fear. These systems have some major disadvantages, however, in that one needed a high level of expertise in order to produce them. Also, targeting the systems is most difficult, thus there was the fear of wiping out ones own troops when attacking the enemy.