Page Turner - S5-E2
Factual error: All the victims were supposedly killed using thalium-201 - a radioactive isotope with a half-life of just 72 hours. e.g.: In the space of two months there would be 10 nanograms for every gram applied to the source of the radiation poisoning (i.e the book) - not enough to make Sid ill without making the perp very ill. He would have had a much higher dose than anyone infected.
Chosen answer: Probably to broaden the scope of the show's plot and give the audience a chance to see the characters in a different setting, People act differently at home from the way they do at their workplace. By the ninth season, the characters would have become overly familiar and predictable. It gives the writers a chance to do something different with them.
raywest ★