Which component is NOT part of an IED according to the acronym PIES?

The correct answer is the Timer. The acronym PIES stands for Power supply, Initiator, Explosive material, and Switch. Each of these components plays a critical role in the construction and functioning of an improvised explosive device (IED).

The Power supply provides the necessary energy to trigger the device, while the Initiator is responsible for starting the explosive reaction. Switches allow for the device to be activated, which can be done in various ways depending on the design of the IED.

Timers, while they can indeed be used in the context of triggering devices, do not form part of the fundamental components outlined in the PIES acronym. Instead, they are considered an additional feature that may or may not be present in a specific IED design. Understanding this breakdown of components is crucial for recognizing how IEDs are constructed and operated, which is essential knowledge for peace officers and first responders.