Which code is used to acknowledge a message in law enforcement communication?

The code used to acknowledge a message in law enforcement communication is 10-4. This code is part of the ten-codes, also known as ten signals, which are utilized to facilitate concise communication over the radio. When an officer or dispatcher uses 10-4, it indicates that they have received and understood the transmitted message.

Using 10-4 helps maintain clarity and efficiency in communication, especially under high-pressure situations where quick exchanges of information are critical. This code is widely recognized and understood not only in law enforcement but across various emergency services and even in civilian contexts such as trucking and dispatch.

The other codes do not serve the purpose of acknowledgment. For instance, 10-1 refers to an inability to copy a message due to poor transmission, while 10-6 indicates that the officer is busy but available for a call. Meanwhile, 10-9 signifies the need for the message to be repeated. Therefore, 10-4 stands out as the correct answer for acknowledging a message.