What can be used against you in a child custody case includes some types of criminal history, lack of involvement with your child, domestic violence or abuse, an intentional lack of cooperation with the other parent, alienating the child against the other parent, and speaking badly about the other parent to the child. Any type of writing could be used against you, too, which is why it is important to be careful with texts, emails, voice mails, social media posts, and even pictures during disputes in DuPage County, Illinois.