Yes read this post FYI: Total Score Example - #3 by Alex98 and how scores for Rescue Maze/Line/Sim are done. In his example they toss out the lowest score.
I asked further down the post why because the rules do not say to toss out the lowest score. He replied it was an ‘unwritten rule’:
Blockquote yes you are right.
The rules do not stipulate that the best y out of x runs must be scored in a tournament.
This depends on the format of the competition and can be freely decided by the organizers.