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In the opening episodes of Star Trek: Picard, two characters need to solve a murder in an apartment—but someone has scrubbed the floors, replaced the windows, and wiped all the alpaca spit from the walls. (The only eyewitness also exploded.) Undeterred, they resort to an alien device that can project a blurry hologram of the recent past. Discuss with your team: if investigators could use such a technology to observe what had happened in a crime or accident scene, would there be any need for judges or juries to determine guilt or innocence? Assuming it can only show you events from the last 24 hours or so, for what other purposes might such a technology be useful?

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