FREE MOVEMENT OF GOODS - QUANTITATIVE RESTRICTIONS - MEASURES HAVING EQUIVALENT EFFECT - HEALTH CHECKS ON IMPORTS OF CURDS - DETENTION OF LORRIES AT THE FRONTIER , EXCESSIVE DURATION OF THE ADMISSION PROCEDURE AND FAILURE TO NOTIFY REFUSAL TO ADMIT GOODS IN DUE TIME - TREND OR GENERAL PRACTICE - ABSENCE OF PROOF - ISOLATED CASES JUSTIFIED ON GROUNDS OF THE PROTECTION OF HEALTH ( EEC TREATY , ARTS 30 AND 36 ; REGULATION NO 804/68 OF THE COUNCIL , ART . 22 ( 1 ))