This story is part of The Dallas Morning News’ monthlong series on how fentanyl has affected our community. WASHINGTON — Hundreds of bereaved family members marched on the White House on Saturday, demanding action in the name of loved ones who died from fentanyl. Advertisement The forecast called for thundershowers, but rallygoers said they were the ones bringing the storm when they gathered on the National Mall for the third annual Lost Voices of Fentanyl event. Advertisement Tears mingled with rain as people lined up banners displaying the faces and “forever” ages of those who died. From the stage, speakers...