Yes. A number of agencies are working on this because chemical or biological injection into a water distribution system would be very difficult to detect and mitigate before citizens were harmed. A number of programs and activities are being coordinated by the U.S. Homeland Security Agency to protect our pubic drinking water systems from terrorist related invasions. These actions include approaches to reduce vulnerability of distribution systems to injection of chemical and biological agents, installation of barriers and sophisticated electronic monitoring devices for remote storage facilities, and the design of monitoring technologies capable of detecting foreign agents that may be injected into the distribution system water itself. The Hach Company, for example, has created a special homeland security technology business to work in the area of real-time water security detection and response.