Great idea to look at the wild pig bait poisoned with sodium nitrite,
@Itsalmosttime!
My conclusion from animal studies is that the overall risk of an animal dying from eating a carcass with sodium nitrite poisoning is probably low. The risk may be higher for animals that eat vomit, the stomach or the digestive tract.
"Sodium nitrite has a low probability of bioaccumulation ... hence secondary poisoning risk would be low."[1] "Pharmacokinetic analyses in different animals and humans have shown that unlike some common rodenticides (e.g. brodifacoum) sodium nitrite is unlikely to cause secondary poisoning due to bioaccumulation."[7]
"My results indicated the mean concentrations of residual SN in vomitus are still potentially harmful to secondary consumers." "Until evidence suggests specific non-target species are at risk, I do not believe that the probability of discovery and consumption of vomit by a non-target species is an area of immediate concern based on the mean attempts of vomit produced, low residual persistence in the environment, and lack of evidence of non-target vomit consumption."[2]
"We found no evidence that captive coyotes experienced SN intoxication from consuming on [pig] carcasses that had been freshly poisoned with SN...".[3]
"We identified no risk of secondary poisoning for non-target scavengers that consume muscle, eyes, and livers of invasive wild pig carcasses because residual SN from the toxic bait was not detected in those tissues. The risk of secondary poisoning from consuming vomitus appeared low because ∼90% of the SN was metabolized or broken down prior to vomiting, and continued to degrade after being exposed to the environment. Secondary poisoning could occur for common scavengers that consume approximately ≥15% of their daily dietary requirements of digestive tract tissues or undigested bait from carcasses of invasive wild pigs in a rapid, single-feeding event."[4]
"For 6 consecutive days, the treatment groups of dogs, cats and chickens were fed entire or partial carcasses from possums lethally poisoned with paste bait containing encapsulated NaNO2. ... None of the dogs, cats or chickens displayed any obvious physiological signs of poisoning or symptoms of methaemoglobinaemia. ... No changes in histology relating to NaNO2 intoxication were observed in dogs or cats after being fed carcasses, minced meat, vital organs or stomachs of possums poisoned with NaNO2."[5]
"In summary, only scavengers that consume [poisoned feral pig] stomach contents, such as canids and vultures, may be at risk and this should be directly tested in pen and field trials."[6]
If hypothetically someone were to do this, hopefully they wouldn't be lost in the woods on a incomplete suicide attempt.
I did way too much research on this unusual, niche topic.
References
[1] L. McLeod and G. Saunders, "Pesticides used in the management of Vertebrate Pests in Australia: A Review." NSW Department of Primary Industries.
https://www.cwba.org.au/wp-content/...nagement-of-Vertebrate-Pests-in-Australia.pdf
[2] G. S. Lawrence, "Evaluation of pH Dependent Prototype Feral Pig Toxicants - ProQuest," May-2017. [Online]. Available:
https://search.proquest.com/openvie...4fba7/1?pq-origsite=gscholar&cbl=18750&diss=y. [Accessed: 28-Oct-2019].
[3] N. P. Snow, K. E. Horak, S. T. Humphrys, L. D. Staples, D. G. Hewitt, and K. C. VerCauteren, "Low secondary risks for captive coyotes from a sodium nitrite toxic bait for invasive wild pigs," Wildlife Society Bulletin, vol. 43, no. 3, pp. 484–490, Sep. 2019.
https://wildlife.onlinelibrary.wiley.com/doi/10.1002/wsb.984
[4] N. P. Snow et al., "Potential secondary poisoning risks to non‐targets from a sodium nitrite toxic bait for invasive wild pigs," Pest Management Science, vol. 74, no. 1, pp. 181–188, Jan. 2018.
https://onlinelibrary.wiley.com/doi/10.1002/ps.4692
[5] L. Shapiro, H. Blackie, D. Arthur, J. Ross, and C. Eason, "Secondary poisoning risk for encapsulated sodium nitrite, a new tool for possum control," New Zealand Journal of Ecology, vol. 42, no. 1, pp. 65–73, 2018.
https://www.jstor.org/stable/26538097
[6] S. Lapidge, J. Wishart, L. Staples, K. Fagerstone, T. Campbell, and J. Eisemann, "Development of a Feral Swine Toxic Bait (Hog-Gone®) and Bait Hopper (Hog-Hopper™) in Australia and the USA," USDA National Wildlife Research Center - Staff Publications, 2012.
https://digitalcommons.unl.edu/icwdm_usdanwrc/1158
[7] S. J. Lapidge and C. T. Eason, "Pharmacokinetics and methaemoglobin reductase activity as determinants of species susceptibility and non-target risks from sodium nitrite manufactured feral pig baits." Report for the Australian Government Department of the Environment, Water, Heritage and the Arts, 2010.
https://www.environment.gov.au/syst...files/pigs-sodium-nitrite-risk-assessment.pdf
You can use Sci-Hub or Google Scholar to find some of the full papers.