I'd compare the possibility and evidence of a bio-weapon being distributed by cotton swab in the nose vs other means. Is it a practical and preferred means to distribute a bio-weapon or are there more preferred methods? This would help me understand how much risk the test is.
Then I'd ask if it's reasonable to want dorm dwellers to take precautions in spreading a bio-weapon by way of aresol.
I'd figure Aresol is a better way to distribute the bioweapon and support means to reduce risk of exposure to the known aresol bioweapon, like a test for the bioweapon.