does the staff read the letters that are sent to the inmate or do they just quickly scan them for gang related stuff?

It is our experience that they read the entire letter. That is what the mail room staff is expected to do. We know that there are a percentage that don't fully follow protocol and scan the letters. But, we advise folks that when they communicate with their inmate, do so mindful that every word you say could come back - so be careful.