https://spanishtrafficlaw.es/section-i-general-rules-of-driving-behaviour/chapter-v-rules-on-narcotic-drugs-psychotropic-drugs-stimulants-or-other-analogous-substances/article-28-tests-for-the-detection-of-narcotic-psychotropic-stimulant-or-other-similar-substances/
Article 28 Tests for the detection of narcotic, psychotropic, stimulant or other similar substances