Poisoning cases, unlike typical crimes of passion, are highly premeditated.
This case was a perfect example.
On June 28th, Fu Lanting showed signs of poisoning, with bruises and purpura appearing on her body.
These are the classic symptoms of poisoning by bromadiolone, a hemorrhagic rat poison.
Her third hospital visit wasn't until September 7th, meaning this had been going on for over two months.
This gave them ample reason to suspect that the perpetrator had administered poison on multiple occasions.
Under such circumstances, there must have been a very strong motive for murder.
Therefore, the special task force initially focused on motive, conducting a thorough investigation into the couple's social network.
Anyone they had ever had a conflict with was investigated.
