A presiding officer may admit, weigh, and consider expert opinions, whether presented in writing or through testimony. Expert opinions are generally admissible if the proffering party demonstrates the relevancy of the expert opinions, as well as demonstrates the general reliability of the expert opinions, both as to methodology and qualifications of the expert. Expert testimony that is conclusory, offers legal opinions, or which is based solely upon hearsay, is inadmissible. Expert opinions may be offered in writing, and may be either set forth formally, as in an expert report, or informally, as in a letter, e-mail, records, or other similar writings.
Idaho Admin. Code r. 62.01.01.485