Fiber optic vampire taps

["Nick Iglehart" <nick () systemsecuritysolutions com>]

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I have a client who has a fiber optic line between two buildings. 
There is no physical security and so they are concerned about someone
tapping into the fiber line and capturing data.  

I read something a while back about tapping fiber optic lines without
breaking the sheathing and now I can't seem to find anything but
vague references to it.  I have googled for hours and checked the sf
archives with no luck.  Anyone have any references to this?  Any help
is appreciated.

Nick

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