You might need to read this
article first.
Anyone played around with these?
I only heard of them because of some beatup in the media under the heading "Kids downloading drugs over the Internet".
Could be 'interesting' to sneak such tones into a movie soundtrack, seems they still work if mixed with other sounds and can be at a low volume.
If you can stomach watching a media beatup:
Wait till the media finds out about Acid :)
Bob.