The use of metal detectors to find someone, hand held metal detector or metal objects in the package. Coil metal detectors to create a small magnetic

field is echoed metal objects. When the metal coil echoed a computer or microprocessor alerts security personnel, metal or

package. The most common metal detectors to walk through, this is the type often at airports or government buildings.
Contrast the public's privacy concerns
Anywhere for all the metal detectors, a major concern for privacy. The system is effective, safe or government guards to

check to see their people passed through the detector, if they have any dangerous or prohibited objects. In the tradition of

civil liberties and privacy, many people become uncomfortable to increase the metal detector. However, supporters walk by

arguing detectors, metal detectors to prevent weapons and weapons found, people attempt to increase public security.

False positives
In the era of modern medicine, factory metal detector there may be legitimate medical reasons, a person on his body metal. If the person suffered

physical injury, through surgery, his body metal equipment, metal detectors may be extinguished, increase the consideration.

However, the monitoring of the security personnel, metal metal detector senses the object to create the image of computer,

security personnel can see, metal objects may be a harmless tool, not a weapon.

Interference with fear
Can electromagnetic fields generated by a relatively small metal detector. However, the size of walk-through metal detectors

will usually produce a large number of electromagnetic fields. This may lead to any nearby electronic equipment, including

medical equipment, electrical interference. The most important thing is that electromagnetic fields may be strong enough to

damage the pacemaker.

To curb violence
The main purpose of metal detectors to stop the violence. Some people worry that the use of metal detectors in school, while

others support their ability to eliminate the weapons detectors of public places. However, studies have shown that, even in

schools to reduce or walk-through metal detectors, specifically from the violence of public buildings, there may be any

number with any particular research methods. In addition walk through metal detector , the further application of metal detectors in public places, the

most likely to increase the public dialogue on privacy.