This app was mentioned in 2 comments, with an average of 3.00 upvotes
Have your phone ready and record the interaction.
If you're worried about the video being deleted, you could download the ACLU mobile justice app, which saves the video on their servers.
https://play.google.com/store/apps/details?id=org.aclu.mobile.justice.mi&hl=en
https://play.google.com/store/apps/details?id=org.aclu.mobile.justice.mi
Tte ACLU has an app for that.