Documentary in French or in German from the American documentary:
The Poisoner's Handbook.
http://www.imdb.com/title/tt3154430/plotsummary?ref_=tt_ov_pl
Charles Norris
https://en.wikipedia.org/wiki/Charles_Norris_(medical_examiner)
From wiki:
Medical examiner
In 1917, Norris, applying for the job of Chief Medical Examiner of the City of New York, took a civil service examination and passed.^[3] Mayor John F. Hylan immediately took legal action against him, claiming that in performing autopsies as part of the examination he had violated the law. Fortunately for Norris, the state government took notice and intervened, forcing Hylan to appoint Norris chief medical examiner.^[2]
Norris immediately set about improving his department. After hiring several distinguished scientists and chemists, including Alexander Gettler, he was forced, due to the lack of any supplies, to buy them all out of his own money. Other problems included the possibility of his workers being drafted to serve in the army (which he solved by writing to Hylan), and the low salaries of his workers, which averaged less than $4,000 a year (approximately $63,000 today).^[2]
Alexander Gettler
https://en.wikipedia.org/wiki/Alexander_Gettler
https://www.amazon.de/Poisoners-Handbook-Murder-Forensic-Medicine/dp/014311882X
http://www.fda.gov/ICECI/CriminalInvestigations/ucm123062.htm

The documentary in French:
http://www.arte.tv/guide/fr/053412-000-A/le-petit-guide-de-l-empoisonneur



Kind regards, Paul.