The Court of Justice enshrined that right in its judgment of 15 May 1986 as a general principle of Union law (Case 222/84 Johnston [1986] ECR 1651; see also judgment of 15 October 1987, Case 222/86 Heylens [1987] ECR 4097 and judgment of 3 December 1992, Case C-97/91 Borelli [1992] ECR I-6313).
Chumhdaigh an Chúirt Bhreithiúnais an ceart sin ina breithiúnas an 15 Bealtaine 1986, mar phrionsabal ginearálta de dhlí an Aontais (Cás 222/84, Johnston [1986]) ECR 1651; féach freisin breithiúnas an 15 Deireadh Fómhair 1987, Cás 222/86, Heylens, [1987] ECR 4097 agus breithiúnas an 3 Nollaig 1992, Cás C 97 / 91 Borelli [1992] ECR, I 6 31 3).