Bluetooth keeps turning on by itself - Is there a way to determine why?

I saw similar questions but there was no generic answer to the issue. Is there a way to determine what is turning my BT ON? I don't have rooted phone (but can ADB) I got Samsung Galaxy S5 with Android 6.0.1. What I did: 1. Turned off BT scanning for "fine localization" 2. Revoked permission to change phone settings to ALL apps that had one (including g services) 3. Disabled all BT scanning related things that I have found. How to find what is turning BT on?