On Tue, 03 Dec 2013 01:43:22 +0000, Danny D'Amico wrote:

Googling, I found this nice fact sheet which shows the
difference between single-dose and multiple-dose rodenticides:

Ooops. Wrong PDF.

This is the PDF I meant to reference that compares rodenticides:
npic.orst.edu/factsheets/rodenticides.pdf

Note: I just realized a gopher is also a rodent...