Hate to say but it likely does go through the whole FBI. Remember the twerking FBI agent in Denver, out nightclubbing when his pistol fell out? Dumb fuck didn't even know when he grabbed for it (a Glock) that it would fire! So there is an example of an entry level agent, no good at all. I'll bet the sweet spot for quality is 20 years in, not in drug or terrorism investigations,  and still a low level agent.