Checks of the obligations to hold, carry and present the documents provided for in article L. 812-1 may be carried out in the following situations:
1° Apart from any identity check, if objective elements deduced from circumstances external to the person concerned himself are such as to reveal his status as a foreigner; these checks may only be carried out for a period not exceeding six consecutive hours in the same place and may not consist of a systematic check of the persons present or moving around in that place ;
2° Following an identity check carried out pursuant to Articles 78-1 to 78-2-2 of the Code of Criminal Procedure, in accordance with the procedures laid down in these Articles, if objective elements deduced from circumstances external to the person concerned himself are such as to reveal his status as a foreigner;
3° Pursuant to Article 67 quater of the Customs Code, in accordance with the procedures laid down in this Article.