It's when the lines are crossed between usually divorced parents.. custodial- custody, who has the legal rights to the child. Interference- crossing lines that shouldn't be crossed.. interrupting and possibility of causing harm to the situation.
it is withholding the child from the other parent. Like say you have joint custody and you tell the father that he can't see his child. That is custody interference. Another example is before custody can be determined in court, you take the child and don't contact the other parent and don't show up to the custody proceedings.
google it and you will get more information than any one person can explain here.
at 7:28 PM on Oct. 27, 2008
it means the person charged interfered with the ote person's right to custody, for example if a father picks up his child for visitation and never returns them.