Luke called Reid to report.
Reid asked Luke to take charge of the scene and said that he would dispatch a forensic doctor and a technical team to support them at the scene.
Cyanide is extremely toxic and acts very quickly, causing death within seconds to 5 minutes after ingestion.
According to the descriptions of two co-workers, the deceased had been working on the rooftop for a while, well over five minutes, so it's very likely that the rooftop was the primary crime scene.
After being poisoned on the rooftop, within a very short time frame, the victim would have lost consciousness, died, and fallen from the rooftop to the ground.
Luke re-examined the fall site and did not find any suspected tools of poisoning or items containing cyanide.
Then, Luke climbed back onto the rooftop and had the victim's co-worker point out where the victim had collapsed.
