RT info:eu-repo/semantics/article T1 El juez español y la compleja cuestión de la determinación del ámbito de aplicación del derecho de la Unión Europea: en particular, en materia de garantías procesales de investigados y acusados A1 Hoyos Sancho, Montserrat de A2 Ediciones Universidad de Valladolid AB This paper aims to critically examine the theoretical and practical consequences of determining with more or less precision the scope of application of European Union law. Some key effects of the Luxembourg Court’s case law in Åkerberg Fransson and Melloni are analysed, in particular from the Spanish judge perspective and with regard to the procedural safeguards of the suspect and accused persons, since several Directives have been approved with a high expansive effect on what may be considered European Union law. Several guidelines are offered to the national legal practitioners to be able to determine in which cases they must opt for requesting a preliminary ruling from the Court of Justice of the European Union or before the Constitutional Court. SN 1132-7170 YR 2019 FD 2019 LK http://uvadoc.uva.es/handle/10324/40803 UL http://uvadoc.uva.es/handle/10324/40803 LA spa NO Revista de estudios europeos, 2019, Nº. Extra 1, (Ejemplar dedicado a: Cooperación judicial transfronteriza y garantías procesales). coord. por Coral Arangüena Fanego, Montserrat de Hoyos Sancho, p. 41-65 DS UVaDOC RD 19-abr-2024