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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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The conclusion is in 20 years, it would be possible to reduce the number of murders considerably

Basis: Embedding miniature devices in the mind of suspicious personnel who have a history of crime.

Gap: What if the devices do not work as efficiently or what if the users of the device are not able to draw correct inferences?

Aim: Weaken

A. Current privacy laws do not permit embedding monitoring devices in humans. Ok if laws do not permit embedding devices then you won't be able to read the state of mind. This weakens the conclusion

B. It is estimated that these devices will be expensive costing upwards of $5000/piece. Price of device is not an issue because th concern is whether we will be able to reduce murders using device. So this option is irrelevant

C. It was recently proved that techniques used by mind readers are not repeatable and will not hold their ground in the court of law. How does it matter whether it holds in court of law or not because we are mainly concerned with preventinh murders using the device

D. People who are arrested when they are about to commit a murder cannot be charged since the murder never happened. Again charging is out of scope because the conclusion is limited to prevention of murders

E. Looking at the pace of current technology improvement, it seems highly doubtful that scientists will be able to produce a miniature device smaller than human cells. So what do we know whether device larger than human cells cannot be embedded in humans. This is a classic trap

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I too feel the same that A is not the best choice for this question, while E gives follows a similar pattern of logic as A does that judges current scenario. To choose the best of 5 I would go with E as it breaks the premise on which the conclusion is held.

Option 'E' is very out of scope as the statement already says that the chips will be available and answer choices can not break factual part of the qns.
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Question says reduce the number of murders considerably and not just prevention which also makes D) a fair contender for the correct answer.
as for A) it is quite extreme to say current laws will be relevant when we are talking so far in the future with introduction of a new technology.
source?
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D as it says embedding tech in suspicious people but if murders won’t occur then on what basis would you choose suspects to embed the tech.

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Why is A the correct answer?
In the conclusion, the author talks about something that will happen after 20 years, and option A talks about the law which is enforced currently. The law can be changes or modified within 20 years or after the launch of the technology.

Why is D not the right answer?
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Option D talks about murder charges, wherein the passage discusses about device installation plan. Hence D is wrong.

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