Not all white powders that suck to inhale are bioterrorism. If you learned about this white powder in chem class, it's chemical terrorism. If you learned about it in Bio class, it's probably biological terrorism. Bleach in the ventilation system is chemical terrorism. Squirrels and/or wasps in the ventilation system are biological terrorism.
Learn the difference, people.
Relevant to something she read that I didn't. Squirrels are also poor houseguests.