Video evidence of personal interactions is very hard to collect in Washington state because it is a "two party consent state"[1]. And people's personal behavior changes when they know they are being recorded[2][3].
I think a better solution to this is to get US Federal "Title VII of the Civil Rights Act of 1964" updated[4] to include caste based discrimination as that will bring this issue to national attention and hopefully enable other people that are not being directly affected by this discrimination to be cognizant of it. Once enough people become aware of the problem then it will start changing the US culturally and societal accepted behaviors which is the only real way to stop this type of discrimination. Of course while dreaming of a better and brighter future I might as well add the removal of all cliques to the list as they are another form of discrimination.
[1] https://www.dmlp.org/legal-guide/washington/washington-recor.... [2](2014) https://hbr.org/2014/09/how-being-filmed-changes-employee-be... [3](2019) https://www.bodycamera.co.uk/blogs/news/what-is-the-observer... [4](2021) https://harvardlawreview.org/2021/06/title-vii-and-caste-dis...