I have always thought that this is the correct process:
1. Is it a shooting foul?
If yes, calling official becomes trail.
If no, go to 2.
2. Is it a non-shooting foul?
If yes, officials switch "vertically".
If no, go to 3.
3. Is the spot in the "new" backcourt?
If yes, old lead (or new trail, if not involving change in possession) becomes new trail and administers throw-in.
If no, go to 4.
4. If 1-3 do not apply (that is, no foul involved and throw-in in the "new" frountcourt), the official who has responsiblity for that line administers the throw-in.
If this requires a "switch" from trail to lead, so be it. Sideline throw-ins below the free throw line extended may be administered by lead or trail.
Any of these incorrect? Any situations missed?
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