Most of these people are lawyers, they cna do some basic research.
I will guess they also have resources, aids, or people working in the Senate that can research this or some sort of budget to pay a lawyer for the research.
If I was the AG and someone asked what the law is, I would send a URL and say "here is the law".
Since most of our laws are written in a f*cked up way that leave a lot of room for grey areas and interpretation, it would be impossible to give someone a good answer, even for the AG, and the AG is not going to spend hours every week meeting with different Senators to explain every law they ask about. Even the AG is not an expert, most lawyers aren't, that is why they keep law books as reference. Although some might keep them because they look good on a wall.