I think my wife is cheating........?

The other night me and my wife Paula had another over to play tegories. We drank alot of wine, and the game was getting kind of competitive, but I could have swore I saw my wife looking at my pad with all the answers on it. I explained to her that she should keep her eyes on her own paper, and that she was breaking the rules, but she insisted that she never looked at my paper. How do I know if she was really cheating?