People say this show is supposedly "so smart" but there's a huge plot hole
So Hank was "onto" Jesse from early on and thought he was up to something
But um, they never once had any surveillance on him to catch him getting a visit from Walter, they missed it every single time Walter went to his place... or called his number (the two of them only ever mentioned using a disposable cell phone once, in the 1st series - and they always knew each other's numbers)
And we're supposed to believe they didnt find out until the last series, that Walter was the kingpin?