Shutterstock February 16, 2021 We tested tiger snake scales to measure wetland pollution in Perth. The news is worse than expected Damian Lettoof, Curtin University; Kai Rankenburg, Curtin University; Monique Gagnon, Curtin University, and Noreen Evans, Curtin University New research fired laser beams on tiger snake scales, and found arsenic was 20-34 times higher in wild wetland snakes than in captive snakes.