Page 30 - 2019-USAPA-Official-Tournament-Rulebook_Float-3

4.O.1. The serve touches the net, strap, or band and is
otherwise good and lands in the service court.

4.O.2. The referee calls a service let.

4.O.3. Any player calls a service let. If the referee
determines that a service let called by a player
did not occur, a fault will be declared against the
offending player.

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USAPA & IFP Official Tournament Rulebook