There needs to be consequences for shitty, procedure-ignoring police work. Period.

Minimum 1 year of jail time for grossly wrongful arrests that could be avoided with standard procedure or investigation tactics that were not applied.

I agree with this sentiment but when you start punishing this sort of thing you create more incentive to cover it up. It's a tricky problem and I'm not sure there's a perfect solution.

What we really need is a change in police culture.

Then the system should be redesigned such that transparency is a priority and cover ups are not feasible. And when cover ups eventually get found out, the punishments even more severe.