A magic bag is frequently used to prevent sensors from picking up signals emitted by anti-theft systems. A few thicknesses of aluminum foil, in theory, will block radio waves. Stuffing a box is another option. Remove the tags off desired things and place them all in a huge box containing another item. This will fool an alarm system into believing you are still keeping track of your loot.
Aluminum has been used for security devices since at least 1954, when it was described by George F. Kennard and John R. Mann in The Science of Security: An Introduction to Protective Engineering. Since then, it has become one of the most popular methods for preventing theft from vehicles. It is easy to use and effective if not removed. However, like any other method, it can be defeated by an expert thief.
Thieves can also use aluminum to their advantage by removing it from items they want to sell later. For example, if you put some nice watches on display in your window, someone could take them out just before going into action, wrap them in aluminum, and leave without being detected by the alarm. The same thing can be done with jewelry, cameras, and anything else that might be stolen if not protected against thieves' tools. Of course, if you outsmart someone, you have won the battle but lost the war because now they know not to steal from you.
Although it may appear too simple to be true, covering the tags with a conductive substance will prevent the alarm from sounding. The aluminum foil bag example from earlier works due to a concept known as "electromagnetic shielding." Since security tags emit electromagnetic pulses when they transmit data, simply placing some aluminum foil between the tag and the sensor will block these signals.
This is not a perfect solution because other devices such as magnetic cards and keys can also set off alarms. However, it does offer one of the easiest ways to avoid detection while opening a lock-up.
The addition of aluminum or tin foil to any bag can act as an electromagnetic shield, blocking the RF or AM signal contained in a security tag or label. This means that even if a bag is scanned using RFID technology, no alarm will be triggered.
The use of this method for evading detection at checkpoints is popular among thieves who want to avoid being tagged and identified by security tags or labels attached to their bags. However, these shields are only effective against a limited number of sensors - after all, how many security guards are going to walk through every aisle of every store with a metal detector? . Also, since most security tags work on a battery power source, they will eventually die off if not checked within a few days. Thus, any bags containing these stolen items should be removed from stores immediately.
Using basic hand tools Older versions of radio frequency security tags may be deactivated by cutting a slit in them, allowing them to be removed before the customer leaves the business. A powerful magnet can also render certain electromagnetic and acousto-magnetic strips inoperable. Using specialized equipment such as scanners or sorters, some retailers will be able to defeat even the most sophisticated RFID tags.
With just a few inexpensive items anyone can build their own scanner that can read most commercial RFID tags. These scanners are called "readers" and they are easy to build using common materials like cardboard, plastic sheets, and magnets. The reader determines its operating range by how far it can reach with an antenna. For example, if you use a piece of string as an antenna, the reader can detect tags within about 10 feet of it. Some readers have multiple antennas that allow them to work on tags beyond their immediate vicinity. Readers are available for purchase online and in hobby stores and many universities have research labs that sell equipment used for tag testing.
Even though scanners can detect tags that have been cut or torn apart, this does not mean that they cannot be reused. A tag that has been slit can be put back together and reused once the new owner knows not to use it inside the store building. This is usually indicated by a sticker attached to the tag when it is placed in stock.
RFID tags Plastic security tags are used to attach a radio-frequency identification chip directly to an object. An alarm is activated when the chip crosses the detection sensor, alerting store staff to the theft. These tags come in a variety of shapes and sizes, including gator, clam shell, and golf ball. Some stores will only accept flat tags, while others will accept three-dimensional ones as well.
Magnetic Strips Magnetic strips are flexible stripes with small magnetic particles on them. They work like credit cards for security devices. When a magnetized piece of merchandise is passed through a magnetic field located inside the detector, this signal is transmitted to the control panel, where it activates an alarm. The alarm can be silenced by passing it through a second time or by lifting it's cover.
Camera Eyes Camera eyes are light sensors that use electricity to detect movement. When an animal moves into view of one of these cameras, its image is focused onto a tiny silicon chip. This chip sends a signal to the controller, which sounds an alarm and triggers video storage if desired. These sensors are usually placed outside the building in surveillance areas known as "dog runs."
Motion Sensors Motion detectors are instruments that measure physical changes within a defined area and trigger an alarm when they sense movement. These movements may be people walking past infrared (IR) beams or metal plates, animals entering seismic sensors' range of sensitivity, or even air pressure changes caused by a moving vehicle.
To block RFID signals, you may use a variety of materials that are poor conductors of electromagnetism—just a few sheets of thick aluminum foil would suffice. Aluminum foil works well to keep them all at bay; you may need to use extra foil sheets. It is important not to let any sheet of aluminum foil touch anything else or it will impair its ability to block radio frequency waves.
Aluminum has several advantages over other blocking materials. It is lightweight and inexpensive. You can find rolls of aluminum foil in most grocery stores for less than $1.00 each. That's significantly less than the price of some of the other blocking materials such as copper and iron. Aluminium is also flexible and easy to work with. No glue or other chemicals are needed to attach it together. You just fold it up and stick it down.
There are many ways to use aluminum foil as an RFID shielding material. One simple method is to cover your entire antenna with a single layer of foil. Be sure to allow enough room around it so you do not run into problems when putting things into your trunk or drawer. If you have multiple antennas, you can wrap each one individually or cover them all at once with a large piece of foil. The key here is to make sure none of the layers overlap each other.
You should also wear rubber-based gloves when working with aluminum because it will attract static if you don't.