The Daily Dot's article.
According to leaked documents, the NSA claims a 100 percent success rate when it comes to implanting iOS devices with spyware. The documents suggest that the NSA needs physical access to a device to install the spyware—something the agency has achieved by rerouting shipments of devices purchased online—but a remote version of the exploit is also in the works.
There's more than one document (but we knew that, eh?). The Dot does miss an implication, though - not all "devices" are bought online, so intercepted shipments alone are unlikely to lead to a 100% success rate. That gives you a choice: you can choose to disbelieve that 100% figure, or you can suspect that NSA has worked out a guaranteed way into those devices. Given that, even in bureaucracies where inflated claims tend to be the norm, a claim of 100% of anything tends to raise eyebrows and require serious justification, I know which side I come down on.