"kony" wrote in message
...
On Thu, 12 Oct 2006 18:43:46 -0800, "Dana"
wrote:


"kony" wrote in message
.. .
On Thu, 12 Oct 2006 16:48:32 -0800, "Dana"
wrote:


You man there actually is something which will detect MP3 recorders?

There are devices that can detect when electronic devices are being
used.
There are devices that can be made that can detect almost any known
material
If said mp3 player is made of that material it can be detected.



Which is not entirely applicable,

Sure it is

Nope, not without the scenario.

Sure it is.



since plenty of
non-recorders are made of circuit boards, ICs & other
discretes, and some plastic. Cell phone and pager are two
quite common ones.

Yep, and all are detectable, and all have signatures.

You have not established that the signature (difference) of
such a device can be discriminated from a different device.

It is being done today.



The scenario has not been defined enough to know if the
device will be turned on within the distance of the
scanner/other detection device.

To detect semiconducter junctions the operating state of the device being
measured is not important.


Detecting electronics devices in general, is it useful?

Depends on who you ask
The OP is not the only one who wants to ensure no one is able to record
conversations, or hear conversations they should not be hearing.

We
dont know the exact scenario,

He gave the scenario.


No.

The scenario was presented with enough detail.




what the result would be of a
positive detection but as above, cell phones and pagers
would tend to be caught and are going to be far more common
and innocuous than a recording device, though in the former
case, the phone may have recording capability too.

True enough, but the technology is there to do what is being requested.
Now
if the OP can afford it, or even obtain it is a different issue.

You have not established this.


Your lack of knowledge of the systems involved is not my problem.
The technology does exist to do what the person wants.
Now how large this equipment is, and how much it costs, and even if it is
available to us regular joe blows is something different.