One solution for police misconduct that I heard recently is to require officers to purchase malpractice insurance[1]. The idea is to incentivize good behavior, as bad actors would pay higher premiums because they're a higher risk (or simply leave law enforcement altogether).
That makes a lot of sense to me. The police do things like this because they rarely, if ever, are held accountable for their actions.
I expect the people who have a strong personal interest in that idea never happening would counter the proposal with warnings of frightful, dire consequences.