Possible Clues:

• Ultimate proof
• Rigorous check requires coupon in order to set up deposit account
• Conclusive trial puts British cops in terrible state
• Appraisal of police department on trial
• Police in rigged state trial that's crucial
• Conclusive trial of success or value
• It determines the value of amended dictates
• It might provide proof for detectives in a trial
• A group of detectives find match in searching examination
• Ultimate proof of drug taken before match