§ 132.340 Duties of district attorney for jury

Here's a plain English summary of this rule:

The district attorney has to help the grand jury do its job when asked. This means writing up formal charges (called indictments or presentments) for the grand jury to review. It also means showing up when the grand jury meets to answer their questions or give them legal advice.

The district attorney can also question witnesses while the grand jury is watching. This helps the grand jury hear directly from witnesses and gather the facts they need to decide whether someone should be charged with a crime. Basically, this rule makes sure the grand jury has legal support and guidance throughout their work, since grand jury members are regular citizens and not lawyers themselves.