Oh boy! I'm flying overseas soon for the first time in about 7 or 8 years. Does this imply they have backscatter and there's no alternative? I'm guessing this i

Oh boy! I'm flying overseas soon for the first time in about 7 or 8 years. Does this imply they have backscatter and there's no alternative? I'm guessing this is at every international airport? I see it's random? Sorry I'd rather ask somebody who's been there then misread the carefully crafted Q&A.