This is not correct, our police in Finland is trusted by people and not corrupt.
How you get there:
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hold police accountable (e.g. every time police fires their firearm, there is investigation that was it necessary)
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require higher education (getting to police requires 3 years bachelor degree)
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teach them de-escalation instead of force
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have police always patrol in pairs (if police is alone, their gun is their partner)
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pay them enough