Makes no difference whether you are caucasian or not.
Once the TSA decides he needs a scape goat or has to meet his daily quota ( even at an early flight at 7 am) you are it ....
Usually I am the target (I am of "olive" colour with a hyphenated name) but during our last trip together hubby ( who is caucasian born in YUL) has had to undergo the second screening ( thank god it was not the Quad

) ..........