Ark. Code Ann. § 26-51-1201

As used in this section, § 26-51-1202, and § 26-51-1203, “invested” includes expenditures made from the proceeds of bonds, including interim notes or other evidence of indebtedness, issued by a municipality, county, or an agency or instrumentality of a municipality, county, or the State of Arkansas, if the obligation to repay the bonds, including interest on the bonds, is a legal, binding obligation, directly or indirectly, of the taxpayer.