Indiana Code Title 31. Family Law and Juvenile Law § 31-34-3-3

Sec. 3. If the custodial parent, guardian, or custodian is believed to reside outside Indiana, the department of child services shall send written notice by certified mail to the last known address of the noncustodial parent, guardian, or custodian on the same date that the child is taken into custody.  However, if the child is not taken into custody on a business day, the department of child services shall send notice by certified mail on the next business day after the child is taken into custody.