One of the panels I made a point of attending was "A Dose of Reality: Forensics"Panelists
Zulema Seligsohn, who translated "Poisons in Mysery Literature" by Alfonso Velasco Martin, which focused on usage in the Golden Age of Mystery.
Dr. Doug Lyle, author and forensics expert.
Priscilla Royal: author of mysteries set in the 13th century.
Thus, we have quite a span of time covered in the panel, which was fascinating. (And because Dr, Lyle was there, laugh-out-loud funny)