Judgment of the Court (Grand Chamber) of 1 October 2019.#Criminal proceedings against Mathieu Blaise and Others.#Reference for a preliminary ruling — Environment — Placing of plant protection products on the market — Regulation (EC) No 1107/2009 — Validity — Precautionary principle — Definition of the concept of ‘active substance’ — Combination of active substances — Reliability of the assessment procedure — Public access to the dossier — Tests of long-term toxicity — Pesticides