Who is responsible for investigating postal offenses?

The correct answer, the U.S. Postal Inspection Service, is the federal law enforcement agency specifically tasked with investigating crimes that involve the postal system. This agency has unique jurisdiction over postal offenses and is responsible for the security of postal employees, mail, and the overall integrity of the mail system. They investigate a wide variety of postal-related crimes, including mail theft, fraud, and the use of the mail for illegal activities, ensuring the safe and reliable delivery of mail across the country.

The role of the U.S. Postal Inspection Service is vital as they not only handle criminal investigations but also enforcement of postal laws, playing a significant part in maintaining public confidence in the mail service. Other entities mentioned, like local law enforcement or the FBI, may assist or collaborate in investigations if a postal offense intersects with broader criminal activity, but they do not have the specialized focus or authority related to postal offenses that the U.S. Postal Inspection Service possesses.