Was an interesting read.
With so many <5 we can assume the natural reading is pretty low?
I think I read one jurisdiction has a threshold of 100 so could assume anything over 100 was given a dose?
The odd ones are higher double figures. These horses have high natural levels? In the feed ala what Mick Hardy tried to use as an excuse? Given a low dose? Tested at a bad time and the reading went down?