yes, in bulgaria law at least back then, they had to spend like 6 months in jail waiting for court to decide if they were gonna be sent back

suffice it to say it was effective, there was only about maybe 60 such people locked up with me in the city of Sofia

there was a few syrians in the low sec prison i got transferred to but they were in for criminal penalties, one interesting one was a syrian doctor who was accumulating heroin to convert to methadone to take back to damascus