You're correct. Manually killing an app from the recent apps list will stop it from doing background processing (e.g. tracking location). I'm not sure if they'l

You're correct. Manually killing an app from the recent apps list will stop it from doing background processing (e.g. tracking location). I'm not sure if they'll be allowed to start again if e.g. they receive a silent push, and I'm also not sure if they're allowed to handle geofences, but besides those two questions, killing the app stops it tracking you.