On Tuesday, Musk posted the results of a urine test that showed he was drug-free, with no traces of 16 substances, including amphetamines, cocaine, fentanyl, marijuana, or opioids. He followed up with a hair follicle test the following day"and goaded Times reporters to post the results of their own drug tests. "The WSJ & New York Times fake journalists' lied through their teeth about me," he wrote in the caption. "Now let's see their drug test results. They will fail." But Musk inadvertently leaked the last four numbers of his Social Security number, putting the billionaire at risk of identity theft from hackers and scammers.