It is said that the victims died of arsenic poisoning, and eventually the source of the arsenic (rat poison) was found in the house.
However, on the cans of poison it says "brodifacoum". Brodifacoum is an organic compound devoid of arsenic, related to naturally occurring coumarin and its semi-synthetic derivatives like warfarin, which are more or less potent anticoagulants. Arsenic is a metalloid element that can be found in elemental form, alloys, and organic or inorganic compounds, in a variety of industries and uses, and its main mode of causing poisoning in the body is inhibition of ATP synthesis.
However, on the cans of poison it says "brodifacoum". Brodifacoum is an organic compound devoid of arsenic, related to naturally occurring coumarin and its semi-synthetic derivatives like warfarin, which are more or less potent anticoagulants. Arsenic is a metalloid element that can be found in elemental form, alloys, and organic or inorganic compounds, in a variety of industries and uses, and its main mode of causing poisoning in the body is inhibition of ATP synthesis.
Ray refers to a cap and gown as "college graduation." It's from a high school graduation because it's light blue, and the girl is a teenager.