“We find out everything, but EVERYTHING about the boy/girl”
Everything, except for what’s on their mind. That, you cannot know until the couple becomes a couple.
What we do have, is extensive damage control, and the ability to cover up like few others can, so when a surprise comes to light, we can deal with it quietly.
Raw data (like whose married to who, and what each one does ((or claims to do)) for a living, where they go for vacations) that we’re better than the IRS.
But the real person? Not until after sheva brachos.