Yes, we've looked that up for you, and there are certain poisons which leave no trace, but it's network policy not to mention them on our programs.
9 seconds sound clip from the Desk Set (1957) movie soundboard.
You can hear this line at 00:04:36 in the Blu-ray version of the movie.
Quote context
[...]
- Is this the Society for the Preservation of Eskimo Culture?
- This is Miss Costello of the Federal Broadcasting Company...
- I'm trying to find out the truth about the Eskimo habit of rubbing noses.
- Yes, connect me. I'll hold on.
- Reference department. Miss Blair.
- Oh, yes. I called earlier about that little black velvet strapless you had in the window.
- Hello. I'm trying to find out the truth about the Eskimo habit of rubbing noses.
- That isn't very much of a reduction, is it?
[...]