Cracked the Case

"This is a case."
With that, our detective spread silence inside the dinner room. "No one touches anything." he continued. Mr.Gregory is on the ground, dead; presumably poisoned, as the foam around his mouth indicates to. "Hmm.." The detective smells Mr.Gregory's dish, "Arsenic.. that's lethal." he murmurs.
He looks at the dead man's wife, she was shaky and nervous hugging her bag; that was suspicious, so he approached her with a grim face. Terrified, she drops a whooping 10 grams of poisoned salami from her bag, which some of it was used in the crime.
Justice was served.