In recent news reports, there has been discussion that
explosives can be detonated with very small voltages,
enough from an iPod or cell phone, possibly even from a
watch. These items are therefore to be banned or remain
banned where they have been.

But where's the logic in this? I assume the electric
shaver sockets in the toilets can be disconnected.
However, there are still the lights. And many other
sources of power you could get to given a few
minutes in a locked toilet....

It seems to me that stopping methods of detonation
being on board is going to be very hard. You really
have to ensure explosives (liquid/plastic/...) don't
get on board?