Would you sacrifice your friend for the greater good? What if drugs where involved?

Theoretically Speaking- Say your very best friend, since birth- Who has stuck by you when even your family didn't had a big secret. Her father was a major drug dealer. Not just a bit of Pot here and there but, Millions and Millions dollars of Hardcore drugs pass through him every week if not day. Say, You found out on accident and, Now you understand how your friend's family is able to maintain thier lifestyle, And all the little things that you never understood made sense. Would you turn her family, Specifically, her father in? What If you knew that It could Ruin, Literally, Ruin her life? She would Not be able to finish collge, Her car, her home, her family would be taken away and she would be engulfed in scandal? Your best friend who never betrayed you, who was more of a part of your family that relatives by blood, Life would be ruined If you informed the cops. What would you do? Sacerfice her for the greater good? Or just let what may be, be?