According to Arkansas state laws no person shall interfere with child custody orders issued in a court decree. Interference with Child Custody is described in State Statute 5-26-502 "A person commits the offense of interference with court-ordered custody if, knowing that he or she has no lawful right to do so, he or she takes, entices, or keeps any minor from any person entitled by a court decree or order to the right of custody with the minor."
The State of Arkansas considers a child to be in joint custody when the parents are legally married and do not hold any court decrees that state specific custody orders.
If a child custody decree has been issued said decree will state the primary custodian. That person is granted full custody of all children listed in the court decree except where stated by the decree or order.
These statutes / ordinances are not direct or complete quotations. Please see given statute/ordinance numbers for exact information.