While there's a lot of mysticism around the field, it is not a small one. In US alone tens and tens of thousands are employed at the various agencies. Only a tiny part are HUMINT working with assets, most have the most A4 office jobs imaginable.

But my point is: The one experience EVERYONE share (those that work there, or have worked), from the sanitary workers to the directors, is that they've gone through the security clearance process. A hefty enough credit card debt could jeopardize the clearance to any one of those.