This week on Sound Medicine, we sit down with policy analyst Aaron Carroll to decipher the latest Supreme Court challenge to the Affordable Care Act. We learn some tips for preparing for the dreaded colonoscopy. And we hear from hospitalist and storm-chaser Jason Persoff, who treated survivors of the devastating EF-5 tornado that hit Joplin, Missouri in 2011. Plus, field producer Andrea Muraskin has a story of the ground-swell building around a life-saving drug that can reverse a heroin overdose.