This study examines the practical observance of human rights during criminal investigationrnin Oromia special zone surrounding Finfine. It attempts to analyze rights of suspects as it hasrnbeen recognized in national, regional and international human rights instruments and effortrnis made to explore whether they are respected in the process of criminal investigation.rnAccordingly, data was collected from three police detention centers found the Oromia specialrnzone surrounding Finfine. Data was collected both from primary and secondary sources.rnPrimary data was obtained through interview, questionnaires and personal observationrnwhere as secondary data from different literatures, government files and legal documents arernreviewed. Questionnaires were disseminated to 41 detained criminal suspects. Interview wasrnmade with key informants from criminal suspects, investigating police and prosecutors andrnhead of police stations and Justice Office. The research mainly focuses on implementation ofrnthe already guaranteed rights of persons deprived of liberty for suspicion of committed crime.rnTo this end, conditions during detention and interrogation as well as treatments in policerncustody are widely examined. Though the Ethiopia legal system has clearly indicated howrncriminal investigation should made and what rights should be respected in the process, theyrnare not implemented well. The study has identified that sometimes police are arrestingrnindividuals without evidence, criminal suspects are not brought to court in the specified time,rnabsence of notification of rights, long pre-trial detentions, condition of detention in policerncustody are below the minimum standard and absence of external monitoring system arernmajor problems. Finally, the researcher has made recommendations that could rectify thernexisting problems.