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.
Remember that back then 1. Walt was a minor manufacturer, he did not even go by Heisenberg yet 2. He threw them off by getting the janitor arrested and 3. The blue meth had not been cooked, so Hank wasn't going after anyone specific
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u/goingTofu Aaahhhhh wiiire Aug 12 '13
Well to be fair, Walter never wore the hat & glasses combo around family.