system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The Grand Jury subpoenas.

I don't understand much about politics and even less the legal system. What does this mean? Why is it happening? What will this change in the grand scheme of things?
gpt
A grand jury hears the available evidence and decides if it's even plausible that a conviction can be reached.   They then decide if it's worth going forward with a prosecution & deeper investigation.

They don't decide decide guilt, they just decide if it makes sense to issue a formal indictment or whether the proceedings should be dropped because they'd be a waste of everyone's time & do nothing but harass the defendant. .