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This is Scientific American's 60-Second Tech. I'm Larry Greenemeier. Got a minute?
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Doppler radar has been a weather forecaster's best friend for decades.
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But more recently law enforcement has found another application.
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For the past two years the FBI, U.S.Marshals and other agencies have used a handheld Doppler radar machine to conduct surveillance through solid walls.
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That's according to USA Today.
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Called the Range-R, this Doppler device sends radio-frequency signals through concrete, wood and other non-metal building materials and can measure the distance between itself and any moving objects on the other side.
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The Range-R can detect even subtle motion like breathing, although it cannot yet identify whether the respiration is coming from a person or their pet.
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Some 200 of the $6,000 devices have been sold.
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The problem is that law enforcement has used the Range-R sort of "under the radar," if you will, sometimes employing it without a search warrant.
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The issue was brought to light in a court case after the device helped U.S.Marshals catch a parole violator at a house in Wichita.
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Federal appeals court judges were not pleased.
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So that's the current situation: police use of the technology to gain an edge versus concerns about violations of Fourth Amendment protections against unreasonable searches.
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Stay tuned for the developing legal decisions regarding this particular Doppler Effect.
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Thanks for the minute, for Scientific American's 60-Second Tech. I'm Larry Greenemeier.
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1 / 14
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显示原文 =This is Scientific American's 60-Second Tech. I'm Larry Greenemeier. Got a minute?
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2 / 14
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显示原文 =Doppler radar has been a weather forecaster's best friend for decades.
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3 / 14
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显示原文 =But more recently law enforcement has found another application.
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4 / 14
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显示原文 =For the past two years the FBI, U.S.Marshals and other agencies have used a handheld Doppler radar machine to conduct surveillance through solid walls.
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5 / 14
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显示原文 =That's according to USA Today.
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6 / 14
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显示原文 =Called the Range-R, this Doppler device sends radio-frequency signals through concrete, wood and other non-metal building materials and can measure the distance between itself and any moving objects on the other side.
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7 / 14
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显示原文 =The Range-R can detect even subtle motion like breathing, although it cannot yet identify whether the respiration is coming from a person or their pet.
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8 / 14
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显示原文 =Some 200 of the $6,000 devices have been sold.
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9 / 14
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显示原文 =The problem is that law enforcement has used the Range-R sort of "under the radar," if you will, sometimes employing it without a search warrant.
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10 / 14
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显示原文 =The issue was brought to light in a court case after the device helped U.S.Marshals catch a parole violator at a house in Wichita.
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11 / 14
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显示原文 =Federal appeals court judges were not pleased.
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12 / 14
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显示原文 =So that's the current situation: police use of the technology to gain an edge versus concerns about violations of Fourth Amendment protections against unreasonable searches.
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13 / 14
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显示原文 =Stay tuned for the developing legal decisions regarding this particular Doppler Effect.
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14 / 14
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显示原文 =Thanks for the minute, for Scientific American's 60-Second Tech. I'm Larry Greenemeier.
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