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were started by an explosive device
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that lead us to a current case.
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Which one's that?
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Finlay's dead motivational speaker.
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Turns out, he was a demolitions expert.
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And he specialized in the type of devices
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that were all found at those old arson sites--
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dynamite with a remote trigger.
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Rings a bell.
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And...
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best that I can tell, the device was a precursor
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to the explosive device that you found at the transformer.