Immigration Employment Document, in the context of UK Immigration Documentation.
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An IED typically consists of an explosive charge (potentially assisted by a "booster" charge), a detonator and an initiation system which is a mechanism that initiates the electrical charge that sets off the device.
IEDs made by inexperienced designers or with substandard materials may result in a shoddy device, and such devices often fail to detonate, and in some cases actually detonate on either the maker or the emplacer of the device (these unintended early detonations are known as "pre-detonations").
IEDs in Iraq may be made with artillery or mortar shells or with varying amounts of bulk or homemade explosives.
IED is clearly defined in the manual of mental disorders (DSM-IV) but no-one really knows how many people might be affected by the disorder.
To be diagnosed with IED, an individual must have had three episodes of impulsive aggressiveness which are grossly out of proportion to the situation, such as that seen in cases of road rage or domestic violence.
IED tends to first manifest itself during adolescence, with the average age of the first episode found to be 14 years of age.