The Khan network provided nuclear technology and assistance to at least four state nuclear programs over the course of three decades. This network was neither static nor a singular entity. Rather, it was a loose collection of actors whose methods evolved in response to a changing world. By the late 1990s, the Khan network was relying on ever increasing levels of subterfuge to procure machine tools from the West while cultivating new locales for the manufacture of centrifuge parts. The trajectory of the network's procurement methods suggests that current supply-side controls are not adequate to block a determined state proliferator.