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- Chemical weapons must be used in relatively large quantities. When used in open areas, NBC agents are subject to dispersion by the wind. For chemicals, which are pound for pound a thousand times less toxic than biological agents.  - Delayed effects can detract from the intended impact. Terrorist activities occur for the purpose of making a public political statement. Determining whether an outbreak of disease or illness is the result of natural causes or terrorism is difficult and time consuming.  - Counterproductive to interests- Groups seeking to gain support for their cause will have a difficult task if innocents are killed in the process.  - Potentially hazardous to the terrorist- The manufacturing and dissemination of agents presents risks to those that handle them.  - Development and use requires skill- Though recipes may be easily obtained, special skills are needed to successfully develop a deliverable product.