A strong rally in cannabis-related stocks this week to mark the start of sales of recreational marijuana in California came to a screeching halt Thursday, on a report that the Justice Department is about to throw a spanner in the works for the nascent weed industry. U.S. Attorney General Jeff Sessions, a longtime marijuana opponent, is expected to rescind an Obama-era policy that gave protections to states that have legalized marijuana as long as they abide by a series of guidelines, the Associated Press reported, citing unnamed sources. An announcement that will scrap what is known as the Cole Memo...