; and (ii) one or more appropriate test methods and procedures to be used to analyze the samples. (C) Guidance Not later than 18 months after the date of enactment of this section, the Secretary shall issue guidance to assist food facilities in developing sampling plans. Such guidance may, as determined appropriate by the Secretary, address when samples should be tested for specific species of contaminants. (3) Contaminants to be tested Each sample taken pursuant to a sampling plan under this section shall be tested for levels of lead, cadmium, mercury, arsenic, and any other contaminant, including other toxic elements, that the Secretary may specify by regulation. (4) Frequency of testing The sampling and testing conducted under this section shall be conducted at least once per quarter of each calendar year. (5) Foods to be tested The sampling and testing conducted under this section shall be conducted for— (A) infant and toddler foods, in final package form