Now a digital warning rather than a paper one, the presence of  
fiche "S"  in the system symbolizes a warning to every law enforcement official or customs officer who accesses someone's file.  
The degree of severity ranges from level S01 to S15 (1 being the highest, 15 the lowest), degrees which indicate the measures law enforcement should take in dealing with the individual. The card is updated every two years.
[5] It is the highest warning possible without giving cause for arrest (or deportation in case of a foreign national),
[4] though it does permit surveillance, including wiretapping and placing GPS-tracking devices on cars.
[6][7] 
Suspects flagged with 
fiche "S" have included
 those who have looked at jihadist websites or met radicals outside mosques, to those considered highly dangerous.
[3]