Widder, I believe arrears pertains to the use of illegal/items and firearms.
Whiskey
Page 33 Page 4 also covers illegal items
The use of a non-SASS legal firearm results in a Stage Disqualification (SDQ) for each stage the illegal firearm is used. Penalties for illegal equipment/items and firearms are not awarded in arrears but should be corrected before the competitor shoots the next stage. Any violations noticed after the shooter has cleared all firearms may not be penalized.