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Dzhokhar Tsarnaev— Case Archive
evidenceevidencephysical2015 Federal TrialHeavily damaged illuminated toggle switch recovered among Scene A materialsKnapp described heavily damaged remnants as an illuminated toggle switch among Scene A materials, although he could not identify it more specifically. He explained that the switch interrupted the circuit during startup, when the controller otherwise briefly sent current to the improvised lightbulb initiator, before the system could be armed.
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Physical Evidence

Heavily damaged illuminated toggle switch recovered among Scene A materials

Knapp described heavily damaged remnants as an illuminated toggle switch among Scene A materials, although he could not identify it more specifically. He explained that the switch interrupted the circuit during startup, when the controller otherwise briefly sent current to the improvised lightbulb initiator, before the system could be armed.

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Knapp testified that the toggle switch was necessary for Scene A's arming procedure; his testimony did not identify who performed that procedure.

Trial Record (1)