Police officers wear badges to identify themselves as a law enforcement officials. The badges are easily recognisable in emergency situations as part of the officer's uniform, and badge numbers specify the identification of the officer. Not all states require officers to give their badge numbers to members of the general public who ask, though some individual departments have adopted the policy. Know your rights when speaking to a police officer, and remain calm and courteous to get his badge number.
Look at the police officer's badge plate. The number should be prominently displayed. Remember the number and write it down as soon as possible after your interaction with the officer. Notice the physical traits of the officer for further clarity.
Ask the police officer for her badge number. Document the officer's name, number plate number and time and location of incident if the officer refuses, though the officer will likely provide you with her badge number.
Look at the citation or police report you are issued. The police officer's badge number or employee number will be listed to identify the person issuing the citation or report.
Do not argue with police officers, as it can escalate the situation and lead to possible future legal ramifications.