How dirty are Halloween masks? MCC's fearless Biotechnology Professor, Stan Kikkert, investigates the germ factor for 3 On Your Side: 

3OYS_ Scary stuff! How dirty are Halloween masks_ _ azfamily.pdf

Also appeared in other news outlets, including:

http://now.msn.com/halloween-masks-covered-in-germs-college-instructor-says

http://www.ibtimes.com/halloween-mask-youre-wearing-could-be-teeming-bacteria-1437036

and Channel 5 did their own version:

http://www.kpho.com/story/23812110/beware-of-halloween-masks-on-store-shelves