From 2023, poisonous rodenticides against rats and mice are only allowed to be used by certified professionals like EWS Group. The possibility for individuals to buy and use these rodenticides is dismissed within the new regulations. Rodenticides are only to be used within Integrated Pest Management (IPM) by a professional like EWS Pest Control. These rules apply from 2023 for both in- and outside, and only as a last resort. The reason for this is that rodenticides are poisonous and difficult to degrade, which makes them detrimental for other animals. You can find more information about this in a press release of the Ctgb: https://www.ctgb.nl/actueel/nieuws/2018/10/02/middelen-tegen-ratten-en-muizen-alleen-binnen-ipm-systeem