Ark. Code Ann. § 15-75-107: Odorization of gas

All liquefied petroleum gases shall be effectively odorized with a distinctive agent at the time of manufacture by the use of an approved chemical agent of such character as to positively indicate the presence of gas in concentrations not to exceed one-fifth (1/5) of the lowest limit of flammability of such gas, except where used in connection with a chemical or other manufacturing processes in which it would prove harmful and would serve no useful purpose as a warning agent.