Ah yes, the good ol'
> You start out in 1954 by saying, “Nigger, nigger, nigger.” By 1968 you can’t say “nigger” — that hurts you, backfires. So you say stuff like, uh, forced busing, states’ rights, and all that stuff, and you’re getting so abstract. Now, you’re talking about cutting taxes, and all these things you’re talking about are totally economic things and a byproduct of them is, blacks get hurt worse than whites.… “We want to cut this,” is much more abstract than even the busing thing, uh, and a hell of a lot more abstract than “Nigger, nigger.”
If you build discrimination into the system you don't have to explicitly discriminate, it's just "the machine". Even better if that's a convenient side-effect of having only ever tested the machine with and for populations you had no desire to discriminate against rather than having had to explicitly build-in the discrimination.
> it's a machine that detects areas of suspect density that could presumably be hiding contraband.
The article is about the TSA, not Border Patrol. Looking for contraband is not the TSA's job.