The Government Accountability Office (GAO) found that the ObamaCare health insurance exchanges are still easily tricked by fake Social Security numbers and immigration details, even more than one year after the weakness was first pointed out. The GAO also found that many have been double-covered by private insurance and Medicaid after enrolling in an exchange plan. “Our undercover testing for the 2015 coverage year found that the health care marketplace eligibility determination and enrollment process remains vulnerable to fraud,” said Seto Bagdoyan of GAO’s Forensic and Investigative Service wrote a testimony before the House Energy and Commerce Committee’s health subcommittee.