I suspect a user is cheating. He's cheated in the past but I don't want to get into it here. Instead I want to contact a moderator about this. What is the best way to go about this? Should I send an email to the SO team or flag a post in question? Though it isn't about any one post but instead a pattern of behavior. I want to provide some fairly detailed findings, at least the best findings a regular user can provide. Also, do moderators have the ability to look into who is casting votes?
You can (as mentioned in the comments):