Xref: utzoo misc.consumers:13962 misc.misc:8354 sci.misc:3830 sci.electronics:8239
Newsgroups: misc.consumers,misc.misc,sci.misc,sci.electronics
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: Telephone privacy gadgets
Message-ID: <1989Oct17.000316.28809@utzoo.uucp>
Organization: U of Toronto Zoology
References: <799@mccall.uucp>
Date: Tue, 17 Oct 89 00:03:16 GMT

In article <799@mccall.uucp> tp@mccall.uucp (Terry Poot) writes:
>There are gadgets one can put on a telephone that purport to tell you if
>the conversation is being recorded. Does anyone know if they work?

They can't; it's fundamentally impossible.  Competently-installed recording
devices leave absolutely no sign of their presence on the phone line, unless
one is deliberately provided.
-- 
A bit of tolerance is worth a  |     Henry Spencer at U of Toronto Zoology
megabyte of flaming.           | uunet!attcan!utzoo!henry henry@zoo.toronto.edu