"I didn't do it," grinned Channing. "Besides, I gotta alibi."
"O.K.," came the amused answer. "No use talking then."
"Just a minute," said Don. "I might as well know what I'm being suspected of. Whom have I murdered?"
"No one, yet. Look, Channing, we're having a time here."
"What kind?"
"Phony money."
"So?"
"Yes. The trouble is that it isn't phony. You can always detect spurious coins and counterfeit bills by some means or another. We have bits of nita-fluorescin in the bills that is printed into the paper in a pattern which is symbolically keyed to the issue—date, the serial number, and the identifying marks on the face of the bill. It takes a bit of doing to duplicate the whole shooting-match, but we've been getting stuff that we know is phony—but, Channing, I have the original and the duplicate here on my desk and I can't tell which is which!"
"Give me more."
"I have a hundred dollar bill here—two of them in fact. They are absolutely alike. They are both bona fide as far as I or my men can tell from complete analysis, right down to the bits of stuff that get ground into a bill from much handling. I have coinage the same way. Isn't there something that can be done?"