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Dzhokhar Tsarnaev— Case Archive
evidenceevidencephysical2015 Federal TrialTrace filters from 410 Norfolk Street, Apartment No. 3, including the Q933 sequenceDavid McCollam testified that some vacuum-sample filters from 410 Norfolk Street, Apartment No. 3, including the Q933 sequence, contained pyrotechnic residues. He identified perchlorate, elevated nitrates and sulfates, but said he did not know the quantity of residue.
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Physical Evidence

Trace filters from 410 Norfolk Street, Apartment No. 3, including the Q933 sequence

David McCollam testified that some vacuum-sample filters from 410 Norfolk Street, Apartment No. 3, including the Q933 sequence, contained pyrotechnic residues. He identified perchlorate, elevated nitrates and sulfates, but said he did not know the quantity of residue.

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The analysis identified pyrotechnic residues but did not quantify them or identify a specific location where the devices were assembled.

Trial Record (1)