Sometimes you want to allow an unverified app for one reason or another, but don’t want to turn off SIP (System Integrity Protection) globally for one reason or another. You might not have permission to do so on a provisioned machine for instance.
In cases like these, I found it useful to override this behavior using this method, since I found it works right away and doesn’t require a system restart.
Run this in the terminal while specifying the app location
sudo xattr -r -d com.apple.quarantine /Applications/APP_NAME.app