The present invention relates to a tamper resistant lid (10) for a container (1). The lid (10) exhibits a centre axis (X) and comprises an outer and an inner member (20, 40). The outer and inner members (20, 40) are further adapted to be substantially prevented from displacement along the centre axis (X) with respect to each other. At least a part of the inner member (40) comprises threads (48) enabling a threaded connection to the container (1) by means of rotating the outer member (20) in a first direction. The lid (10) further comprises at least one stop member (51, 52, 53, 60) preventing the inner member (40) from rotation with respect to the outer member (20). The at least one stop member (51, 52, 53, 60) is adapted to be controllably disabled with a designated force after said inner member (40) has been connected to the container (1), so that the outer member (20) can be freely rotated with respect to the inner member (40) to thereby prevent removal of the lid from the container (1). The present invention enables the sealing of a container, while substantially preventing the container from being reopened.La présente invention concerne un couvercle inviolable (10) pour un contenant (1). Le couvercle (10) possède un axe central (X) et comprend un élément externe et un élément interne (20, 40). Lélément externe et lélément interne (20, 40) sont en outre conçus pour être quasiment incapables de se déplacer lun par rapport à lautre le long de laxe central (X). Au moins une partie de lélément interne (40) comprend un filetage (48) qui permet de le visser sur le contenant (1) en tournant lélément externe (20) dans un premier sens. Le couvercle (10) comprend en outre au moins un élément de butée (51, 52, 53, 60) qui empêche lélément interne (40) de tourner par rapport à lélément externe (20). Ledit au moins un élément de butée (51, 52, 53, 60) est conçu pour être désactivé de façon contrôlée par application dune force désignée après que ledit élément interne (40) a ét
