I have observed many libero replacement issues being handled differently (and often incorrectly) by officials.  The DCR doesn’t do a great job of addressing some libero situations, and I think there is a fair amount of confusion (especially with those who work multiple rule sets).  Perhaps a number of different scenarios, such as the following, could be addressed:

  1. Libero (or replaced player) enter/leave outside of the replacement zone.
  2. Libero replaced by a player other than whom s/he replaced.
  3. Libero replaced by a player other than whom s/he replaced, and whom the coach immediately wants to substitute out.
  4. Two replacements (in/out) during the same dead ball.
  5. A team attempts a double replacement (like NCAA/NFHS) where two non-libero players replace each other with the libero going back to RB to serve.
  6. The libero enters the set and serves