there's two types, one which everyone goes through where they take your biographic info and run it though some databases and if it doesnt return any adverse info you get cleared this takes a few days, the second type is a more comprehensive check where they wait for clearances from other countries you visited which takes several months to years.Hi Navin, can you please explain what they do in security screening??
the type of screening you are chosen for depends on several factors like nationality, type of work, travel history etc.