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Straight from the BAR website.

[URL unfurl="true"]https://www.bar.ca.gov/arsc/newsletters/newsletter/spring-2020/cal-id-and-cvn-detect-programming-modifications[/URL]


"BAR will implement Cal ID and CVN checks for most model-year 2000 and newer vehicles as part of the On-Board Diagnostic Smog Check inspection failure criteria"


Could be your dads model hasnt made the list yet. The only reason I know this is because I own an Evo and have seen countless others in that community get flagged to the state referee for failing the checksum.


*Edit, I misread you comment (thought you said your dads truck was smogged last year). This was implemented in 2020.


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