463 Mass. 353 - Appellee Commonwealth Brief - Mass Cases

Westbrooks, 79 Mass. App. Ct. 417, 423 (2011). See
also Commonwealth v. Dawson, 399 Mass. 456, 467 (1987).
Ronald Mendes further testified that he purchased
the twelve dime bags, rather than one package from this
"E" person because that was the only amount that "E"
sold. (Tr. 2: 226.) . He testified that the two bags of
marijuana located in the jacket in the living room were
also his .. (Tr. 2: 226-228.) The quality of the bags
of marijuana found by police was similar, he testified,
to what he "smoked every day." (Tr. 2:239.)
Ronald Mendes also offered expert testimony on the
subject of marijuana and cocaine addiction, calling Dr.
Alan Wartenburg, (see Tr. 2: 146-158,) testimony that
tended to corroborate Ronald Mendes's testimony
concerning the composition of the substances that
police found in his bedroom and in his living room as
being cocaine and marijuana.
Based upon this evidence, the certificates of
analysis was "merely cumulative of properly admitted
evidence," Degraca, 447 Mass. at 555; Mahdi, 388 Mass.
at 696, that established the composition of the
substances found in Ronald Mendes's bedroom and in his
living room as being "cocaine" and "marijuana." The
evidence .that the substances were cocaine and
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