Hearsay within hearsay is not excluded by the rule against hearsay if each part of the combined statements conforms with an exception to the rule.
Fed. R. Evid. 805
NOTES OF ADVISORY COMMITTEE ON PROPOSED RULES On principle it scarcely seems open to doubt that the hearsay rule should not call for exclusion of a hearsay statement which includes a further hearsay statement when both conform to the requirements of a hearsay exception. Thus a hospital record might contain an entry of the patient's age based on information furnished by his wife. The hospital record would qualify as a regular entry except that the person who furnished the information was not acting in the routine of the business. However, her statement independently qualifies as a statement of pedigree (if she is unavailable) or as a statement made for purposes of diagnosis or treatment, and hence each link in the chain falls under sufficient assurances. Or, further to illustrate, a dying declaration may incorporate a declaration against interest by another declarant. See McCormick §290, p. 611.
COMMITTEE NOTES ON RULES-2011 AMENDMENT The language of Rule 805 has been amended as part of the restyling of the Evidence Rules to make them more easily understood and to make style and terminology consistent throughout the rules. These changes are intended to be stylistic only. There is no intent to change any result in any ruling on evidence admissibility.