From the outset, the raison d'être, the sine qua non of the lifting of internal border controls was the existence of compensatory measures designed to prevent the much-feared security deficit.
De la bun început, la raison d'être, condiţia sine qua non a desfiinţării controalelor la graniţele interne a fost existenţa unor măsuri compensatorii, destinate prevenirii mult temutului deficit de securitate.