In NZ my understanding of our policy is that a target can be challenged up until the second person has shot it. After that everyone has to shoot it.... if at the end of the course no one has dropped it then it will be checked and if found to have fault it will be removed. If someone drops it over the course of the day than tough bikkies....
The obvious exception being a target malfunction along the lines of a wrapped chain or broken string (we pull the targets up when we start a lane, not when we finish).
"Astrid" - Steyr LG110FT / Falcon T35S
"The Bangstick" - Falcon FN19 .25 FAC / BSA 8-32
Too many tinker projects, not enough working rifles.