The show originally started out as a ten hour mini-series. We shot two hours and then were excused for a while, for no apparent reason. Things went very quiet for a time and then a few months later we were called back and told that it was going to be a full season.
Arsenic sticks around and today it's easily found after death if somebody thinks of looking for it, because the problem with arsenic, it isn't looked for in the common tests for drugs.