Several near deaths on the world’s highest peaks have shed light on a dangerous trend in mountaineering: rampant use of performance-enhancing drugs, particularly the powerful steroid dexamethasone. Devon O’Neil reports on how dope is corrupting the game.Outside's long reads email newsletter features our strongest writing, most ambitious reporting, and award-winning storytelling about the outdoors..By the time Jesse Easterling stumbled into the  emergency clinic, he was nearly incoherent. It was a chilly afternoon at Base Camp, May 17, 2009—two days before the beginning of summit...…Several near deaths on the world’s highest peaks have shed light on a dangerous trend in mountaineering: rampant use of performance-enhancing drugs, particularly the powerful steroid dexamethasone. Devon O’Neil reports on how dope is corrupting the game.Outside's long reads email newsletter features our strongest writing, most ambitious reporting, and award-winning storytelling about the outdoors..By the time Jesse Easterling stumbled into the  emergency clinic, he was nearly incoherent. It was a chilly afternoon at Base Camp, May 17, 2009—two days before the beginning of summit...WW…