For the Testing plants unit I looked up the contact details of where you can get information about poisonous plants in your country. I did not find an organisation that specialises in poisonous plants only, but I did bump into the website of the Nationaal Vergiftigingen Informatie Centrum (NVIC) (https://www.umcutrecht.nl/subsites/nationaal-vergiftigingen-informatie-centrum-nvic/contact).
There is a telephone number that health care professionals can dial in case of acute poisoning, but there is also a number and e-mail address for ‘overige vragen’ (other questions). So I guess that would be the way to go.