Arkansas Fire Prevention Code Volumes I and II (IBC/IFC) pg 125:
Group R occupancies, including new or substantially remodeled apartment buildings and hotels, must be equipped with single-station carbon monoxide alarms (Effective January 1, 2014)

Arkansas Fire Prevention Code Volume III (IRC) pg 63:
New and existing one- and two-family dwellings and townhomes of not more than three stories are required to be equipped with CO alarms outside of each separate sleeping area and in the immediate vicinity of bedrooms in dwelling units. (Effective January 1, 2014)