Figure 1.
The number of countries of the Chemical Weapons Convention (CWC) declaring different types of riot control agents (RCA) in 1999, 2005 and 2011.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.