Well, of course the gov't withdraws. Even if the NSL is legit, the gov't should probably withdraw for the simple reason of protecting their program and their in

Well, of course the gov't withdraws. Even if the NSL is legit, the gov't should probably withdraw for the simple reason of protecting their program and their investigation from scrutiny. They already have the information they need. And, they can simply re-file the NSL later if that becomes necessary. Now, consider the gov't's probable reaction when the NSL isn't legit, and they know it (I suspect this is the case for the majority of NSL's). The best strategy is still to withdraw the NSL, and evade scrutiny as much as possible.