Waste Not is the ninth episode of the third season. It was released on 17 November 2006.

Charlie's investigation of a company's toxic paving material is impeded by a new school administrator at CalSci, who wants him to focus primarily on his pure academic work instead, while for Don the moral and the legal don't quite add up.


The phrase "Waste not, want not", the mantra of the pack rat, would seem to be the origin, although here there is equally the toxic waste element and the massive sums of money available to those who dump illegally.