The point of the post was to get the message across that I have a little experience on the subject,About 40 years worth.
Secondary poisoning is always a problem however a legal bait in WA should weigh aprox 200grms and should contain 4 mg of sodium monofluoroacetate.
It requires a lethal dose of 9.5mg / Kg to kill a wedge tailed eagle.
4 mg is the smallest amount of poison that can be accurately measured.
The baits are not stacked in a pile but spread out over large distances,maybe 8 /mile.
Your boys in SA are either using 1080 incorrectly or are using another poison,most likely strychnine or arsenic.
1080 is also bio degradeable unlike most other poisons.
Al