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Dzhokhar Tsarnaev— Case Archive
locationlocation410 Norfolk Street, Apartment No. 3home410 Norfolk Street, Apartment No. 3David McCollam testified that some vacuum-sample filters from 410 Norfolk Street, Apartment No. 3, contained residues of pyrotechnic material, including perchlorate, elevated nitrates, and sulfates. He said the analysis established presence rather than quantity and did not indicate a specific assembly location.
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410 Norfolk Street, Apartment No. 3

David McCollam testified that some vacuum-sample filters from 410 Norfolk Street, Apartment No. 3, contained residues of pyrotechnic material, including perchlorate, elevated nitrates, and sulfates. He said the analysis established presence rather than quantity and did not indicate a specific assembly location.

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Residue testing connected the apartment to pyrotechnic material, but McCollam did not quantify it or identify a specific assembly location from the residue evidence.

Trial Record (1)