What is a Weapon of Mass Effect (WME)?
For the purposes of CFATS, a Weapon of Mass Effect is a poisonous by inhalation gas that the Department of Transportation (DOT) includes on its hazardous materials regulations and which DHS believes has the potential to be stolen or diverted and used as a weapon of terror. Additional information on the treatment of WME under CFATS can be found in the preamble to Appendix A to CFATS at 72 FR 65404.