What is the safest way to bet on SAFER marijuana banking reform?Marijuana stocks glowed green again on Monday due to news of progress on marijuana banking reform in Congress. According to Senate Majority Leader Chuck Schumer (D-N.Y.), the Senate is on course to pass new cannabis banking rules in the not-too-distant future. And while we've heard this song before, investors are starting to hum along again anyway.As of 10:35 a.m. ET, shares of Canopy Growth (CGC -0.07%) were up about 0.3%, Cronos Group (CRON 0 ...