The PGA Tour has suspended Dustin Johnson for six months after he tested positive for cocaine, according to a report on Golf.com. Citing a source, Golf.com reported that Johnson has failed three drug tests -- two for cocaine (in 2014 and 2012) and one for marijuana (2009). Johnson, 30, was suspended for the 2012 failed test, Golf.com reported, but that suspension was never made public. Under its guidelines, the PGA Tour is not required to announce any disciplinary actions against players who test positive for recreational drugs. Johnson announced Thursday that he was taking a leave of absence from competition,...