FierceHealthCare is reporting CMS "delayed on Friday implementation of a policy requiring signatures of physicians or other clinicians to approve requisitions for clinical diagnostic laboratory tests. The policy, scheduled to go into affect on April 1, will not be enforced this year – the second time since December the agency has delayed its implementation."
There is lots of political pressure on this issue. See the links to the letters at the bottom of the article from high Senators and Congressmen. But in our investigations, we've seen that a physician certification or at least signature is an effective way of preventing fraud.