Friday’s episode of PBS Need to Know, hosted by Alison Stewart, will feature ProPublica’s Joaquin Sapien and Aaron Kessler, formerly of the Sarasota Herald-Tribune. The segment will examine the harmful effects of tainted drywall – a product which numerous homeowners say has caused serious respiratory problems, bloody noses, migraines and rendered thousands of homes worthless.

Friday, April 22, 2011 (Check your local listings for exact air times)