Conduct periodic inspections of building facilities and HVAC systems for potential indicators/irregularities;
 

Increase visibility in and around perimeters by increasing lighting and removing or trimming vegetation;
 

Validate vendor lists for all routine deliveries and repair services;
 

Restrict vehicle parking close to buildings;
 

Require identification, sign-in, and escorts for visitors;
 

Instruct people to be especially watchful for suspicious or unattended packages and articles either delivered or received through the mail;
 

Potential indicators of Weapons of Mass Destruction [WMD] Threats or incidents

 

	Unusual/suspicious packages or containers, especially those found in unlikely or sensitive locations, such as those found near air intake/HVAC systems or enclosed spaces;
	Unusual powders or liquids/droplets/mists/clouds, especially found near air intake/HVAC systems or enclosed spaces;
	Signs of tampering or break-in to a facility or maintenance/utility area;
	Reports of suspicious persons or activities, especially those involving sensitive locations within or around a building;
	Dead animals/birds, fish, or insects.