I took an Implicit Bias Test several years ago in college. I think they may have only had a couple. I recall about what my results where then and they are the same, or close, now. I also got to do a few more. I did not feel stressed or uptight and perhaps that was because I had seen the test before. I think it is a useful reflection tool. My results overall were about what I thought they would be. I want to do some other ones sometime.
I also saw the Jane Elliot work a long time ago and some of the follow up work. I showed it to my 8th graders one year as we were talking about bullying. We talked about the dated language and terms before we started. There were some things that amazed the students. Even though our school community is about 75% white it was not like the rural kids in the film. There were some really interesting conversation. I know there can be hazards to such activities and yet there is such a need for folks to really try to sink into what life might be like for _____ under _________ conditions. Starting with the kids is part of the solution but if the adults in their lives who they look up to are modeling racism (or any of the other collection of isms) it is hard to help the kids shift. I think there are people who might be open to Ms. Elliot's message that might not be as open to a POC. If a POC said some of those things some people might feel attacked and assume the POC is and angry hostile person. The scrutiny is often different.