That may sound a rather haphazard approach to network security, as detectors are randomly generated and die out from time to time.
They had to make their way through tight security, including metal detectors and bomb-sniffing dogs.
They made their way through tight security, including metal detectors and bomb-sniffing dogs.
Just a few meters away, behind stained-glass doors, metal detectors, security guards and video cameras, scores of ethnic-Chinese Thais are hunched over green felt tables playing blackjack, baccarat and roulette.
Educationalists have spoken of the need to make schools safer, with metal detectors, security guards and conveniently placed cell phones (one Columbine student, cowering under a desk, failed to get through to the police but managed to use his cell phone to talk to a television station).
To lure jittery visitors back into his rooms and restaurants, where most of the carnage took place, he is adding luggage scanners, metal detectors and more security cameras to his 20 hotels in India (he has a total of 27 in five countries).
To lure jittery visitors back into his rooms and restaurants, where most of the carnage took place, he is rapidly adding luggage scanners, metal detectors and more security cameras to his 20 hotels in India (he has a total of 27 in five countries).
One man combined WeMo switches and motion detectors into a home security system.
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Security at the gate, metal detectors, guards and the blocking of all forms of electronic communication in a manner that would impress in China.
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In past decades, schools have installed metal detectors, hired extra security to patrol grounds and hallways and instituted other zero-tolerance measures to make campuses safer.
They include products and devices such as Bluetooth headsets used with cell phones, handheld metal detectors used by airport security, iPods, iPhones, electric blankets and pills that are swallowed and used to image internal organs by transmitting wireless data.
Six of these airports are testing the machines as a primary security check option, instead of metal detectors followed by a pat-down, she said.
The results of this study indicate that solutions cannot be found in simple measures like building walls and fences, putting up bars, using metal detectors, or employing private security services.
Some students say they want the administration to install security features such as extra cameras and metal detectors.
All visitors are security checked and have to pass through metal detectors.
Ter Horst said that security measures in place in Amsterdam were metal detectors and X-ray machines, and admitted they could not have picked up the explosive material that AbdulMullatab was allegedly carrying.
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Mr Medvedev's order to heighten checks at Domodedovo forced all visitors to walk through metal detectors and led to overcrowding, a security risk in itself.
The system can gather data from security cameras, license-plate readers, radiation detectors and 911 calls and hunt through dozens of existing law-enforcement databases for related information.
Hence state security had not swept the area with their mine-detectors.
The initiative, which dates back to 2005, involves an extensive network of security cameras, licence-plate readers and weapon-detectors which work together to spot threats and deter terrorist surveillance.
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Anti-explosive robots and radiation detectors are also part of the stepped-up security detail.
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