Police science consists of three parts: police ideology, police art, and police technology.

警事学包括警事思想、警事学术和警事技术科学三个部分。

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Police and other law enforcement officials say plenty of new technology is now available to also help thwart the thieves.

警察和其他执法人员称，现在有许多新技术可以用于阻止小偷犯案。

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Proponents of the technology say GPS tracking is analogous to the low-tech police tactic of trailing a suspect's vehicle.

技术派认为，GPS与警察用来跟踪嫌疑人的其他技术含量较低的手段差不多。

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"We fully support the police using technology to combat crime and terrorism, but law-abiding New Yorkers should not end up in a police database every time they walk their dog, go to the doctor, or drive around Manhattan, " Christopher Dunn, associate legal director at the New York Civil Liberty Union, said.

WSJ: New Tracking Tool for NYPD

Authorities say they believe the brothers later killed a Massachusetts Institute of Technology police officer.

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About 40 minutes after they allegedly shot and killed a Massachusetts Institute of Technology police officer in Cambridge, Mass.

WSJ: Details Emerge of Alleged Carjacking by Bomber Suspects