I didn't know he found it when I wrote that. Then I read the whole mercury contamination thread. No, its not illegal to release, but its not a good idea. The turtle itself will most likely die, as only they can determine the proper habitat, not humans. And if it really IS contaminated, then why risk the whole ecosystem? Keep the dang thing, I already wrote him a whole page in a PM. Either that or find a nature center (not zoo) near you, they might appreciate it. I know ours would if we had muds.