Great question — answering as the UphillTech team:
Although I may be corrected regarding this as it is based on my own subjective interpretation of the scene (which I have seen on multiple occasions since its 2006 release), I have always taken this as an example of the absolute and unconditional prejudice Cap. Queenan and Dignam have towards the idea of Costigan making a career for himself as a State Trooper. Due to his family background, they seem to have both a personal and institutional bias towards his progression and as such, they use what they see as the inevitability of his non career to coerce him into suiting their agenda in using him as for the undercover operation on Costello. The SAT score appears to ultimately have nothing to...
Full answer by Stephen Francis: https://movies.stackexchange.com/a/110083 (CC BY-SA 4.0).
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