On Wed, 11 Oct 2006 17:28:13 -0500, "Ken Maltby"
wrote:

That may be useful if you have an object in your hand, but
remember the unknown context of this thread, and that they
can't be constantly false detecting cell phones, beepers,
etc, providing the cell phone isn't recording off-grid which
is a whole 'nuther issue.


Normally people entering rooms have to pass through
doorways. I would think any "open mike" that responds to
the pattern should be considered a threat.


Sure, but we haven't established that it really will be
detectable based on a pattern of sound. Presuming it will
because some other type of device can be detected isn't
reliable.


But look, you can believe what you want, your world can
be a much simpler place, if you don't delve into these issues.

This is a fairly generic non-applicable comment. We could
as easily consider the opposite, that you can believe what
you want and your world can be a much more paranoid place if
you don't delve into the specifics- but either way we cannot
assume detection without any evidence of same type device
BEING detected in an applicable scenario. While a doorway
detector could be more easily implemented than some, it's
also not going to detect a device turned off at the time.

We'll have to consider the specifics of a digital recorder,
and perhaps even more significantly one that might be chosen
to be harder to detect if it were to be used for a stealthy
purpose.