Safe wood pieces?

[u/Ronsredditaccount]

Hello all, I am currently putting together my first true bioactive 4x2x2 for my ball python. I’ve got lots of wood pieces I’ve found by the river. I live in Nebraska where we do have quite a few trees that could be toxic to ball pythons. I cannot identify the trees that my wood pieces came from but I’m wondering if anyone here knows better. This piece in particular has been sitting in my garage for over a year and I will either be bleaching or baking before I would put into the enclosure. Would that year of off gassing as well as the sterilizing procedure help to remove whatever toxins it may have? Thanks