The civil action stems from a police raid where the complainant, Suitupe Misa, was arrested in in front of shoppers and vendors at the Savalalo market in 2015.
The office of the Ombudsman launched an investigation into the apparent wrongful arrest in 2016 after a complaint by Misa.
The Ombudsman reported that the Commissioner of Police failed to meet basic investigation principles and placed undue consideration on second hand evidence, leading directly to the wrongful and unlawful arrest of Suitupe.
"The Commissioner's decision to arm and allow the use of firearms by his officers contravened the Use of Force policy, was irresponsible, and could negatively impact the overall safety and security within Samoa," the report said.
The report also found that the arrest was "unlawful and improperly undertaken and therefore violated his fundamental human right to liberty".
According to the Ombudsman, the findings clearly demonstrate a series of errors of judgement and unlawful actions that are nowhere near what should expected from the Samoan police force.