Case Study: You are a Sub-Divisional Police Officer (SDPO). An influential local politician's son is involved in a hit-and-run accident that kills two homeless people sleeping on the pavement. The politician attempts to substitute the driver with an elderly family servant who confesses under coercion. Your senior police superintendent advises you to accept the driver's confession to avoid friction with the ruling political party. (a) What are the ethical obligations of a police investigator? (b) How will you ensure that the real culprit is brought to book?