A news from "Murder Suspect Has Witness: A MetroCard", New York Times, has made clear the role of bus or subway turnstiles as electronic evidence maker. In this case, the airtight alibi provided by the byproduct of swipping metrocard through the slot of a turnstile in order to pay the fare has changed Mr. Jones' destiny which otherwise might not be possible back then when there wasn't such kind a device.
Although criticsims about its Big Brother effect have been haunting around for years, it'd be better to be able to set people free when they are guiltless and when our technology allows than worrying about being monitored by secretive operations of Big Brother. Now, it's people who take public transit leave their electronic evidence. But not too long later, when each car starts talking to each other, to the road, and to the highway administration center, electronic evidence will be even more powerful when it becomes ubiquitous.
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