狗镇-有温柔乡
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狗镇-有温柔乡

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序  号: 923251
标  题: 你真是执着 (2千字)
发 信 人: solution  [发短消息]
时  间: 2016-12-06 11:06:46
阅读次数: 239
详细信息: [只看帖主]
How do bank robbery dye packs work?

The ink thing that explodes to mark all the stolen money. How much do the devices cost? What companies make them? Are they triggered when the person opens the bag, or on a timer? How effective are they at deterring bank robberies?

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I don't know how much they cost or who makes them. Most dye packs are concealed inside a stack of bundled bills.A space is cut out of the center of the stack for the dye pack mechanism. The pack is activated either via a magnetic reed switch that is closed when the pack is removed from the cash drawer (a magnet in the bottom of the drawer holds the switch open), or by a radio signal in the bank. Some types employ a RFID chip like the anti-theft devices used in some stores. When the chip passes through a field around the bank's door, it activates the dye pack.

Once activated, a timer inside the pack starts to count down. After a few seconds to a few minutes, a small explosive detonates, staining all the money and often the robber, too. The stains on the money make it easily identifiable as proceeds from the robbery, so it's no good to the robber. Packs have been known to go off in the robber's hand as he goes through the money from the robbery, looking for the dye pack. These have caused some minor injuries. There are also some models of dye packs that include smoke bombs and tear gas.

Dye packs are only moderately effective in deterring robberies. The robber doesn't know if that bank uses dye packs or not, so that deterrent effect is lost. Most robbers know that dye packs are in common use and tell the bank tellers not to include any dye packs or they'll be hurt. Robbers have been known to find the dye packs before they go off and discard them, taking the rest of the money. That would be a risky business, as the dye pack bundles look just like any other cash bundles until you riffle through the stack of bills.

Another anti-robbery device with a similar theme is a radio transmitter concealed in the same way the dye packs are. When the bundle is removed from the cash drawer, the transmitter activates. Local law enforcement vehicles are equipped with direction-finding receivers, similar to the Lojack anti-vehicle theft system. The receiver panel in the police car indicates the bearing of the transmitter and the signal strength. Robbers have been known to be fleeing the scene to find half a dozen police vehicles following them. You can usually tell which law enforcement vehicles have direction-finding receivers in them by the array of antennas on the vehicle roof. Direction-finding usually requires four similar-looking short antennas.

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