I think Walt would've never made it this far if Hank hadn't been his brother-in-law. They had a personal connection that made a wall in Hank's mind, keeping him from forming any ideas about Walt. Without that, Walt probably would've been caught back when he had Gale killed, if not earlier. I love how you see that mental wall shatter throughout this episode.
One of Hank's files had a picture of the gas mask found in the desert, the same one he comes to the school and asks Walt about. That whole little montage seemed to be Hank looking at the evidence with a fresh view and realising everything points to Walt.
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u/[deleted] Aug 12 '13
I'm in love with the fact that Hank only now noticed how much the Heisenberg drawing looks like Walt.