This app was mentioned in 4 comments, with an average of 1.25 upvotes
Mobile Justice: Missouri - Apps on Google Play https://play.google.com/store/apps/details?id=org.aclu.mobile.justice.mo&hl=en_US
This is what I could find for Android.
Mobile Justice - Missouri on the App Store https://apps.apple.com/us/app/mobile-justice-missouri/id960695671
This one for iOS.
Everyone should download an app from the ACLU called "Mobile Justice", which allows you to record law enforcement and securely submit it to them immediately.
Here is one from MO/St.Louis. Local branches across the US are available, but if it's serious I don't think it'll matter to which you send it in.
https://play.google.com/store/apps/details?id=org.aclu.mobile.justice.mo
Yup
https://play.google.com/store/apps/details?id=org.aclu.mobile.justice.mo
Still don't quite understand the one app per state. I think I get it but its still odd.