A more thorough explanation:

Pocket part

A small booklet that is found inside the back cover of certain legal reference books. It contains the most current updates to the law.

Let's say you are a lawyer and you are using a legal reference book to research a case. You notice that the book was published a few years ago and you want to make sure that you are looking at the most current law. You would then consult the pocket part, which contains any updates or changes to the law since the book was published.

Another example would be if you are a law student studying for an exam. You are using a legal reference book to study a particular area of law. You want to make sure that you have the most up-to-date information, so you consult the pocket part to see if there have been any changes or updates to the law since the book was published.

These examples illustrate how the pocket part is used to ensure that the most current law is being examined. It is important to use the most up-to-date information when practicing law or studying law, as the law can change frequently.