I believe I've read somewhere that in the old days, people didn't know better, and lots of people kept their snakes on pine.
If I were placing money on a bet, I'd say that it is at least possible to keep a snake healthy and use kiln dried pine bedding. But you'd probably need lots of ventilation to keep harmful vapors to a minimum, and ventilation would be problematic in a BP enclosure because that would make it hard to keep up humidity. I'd also think very prompt changing of the bedding any time it was soiled or water was spilled would be a must.
Just because I think it is probably possible doesn't mean I'd do it myself. There are plenty of alternatives, so why use something that is potentially causing harm to my animals? Even if that harm is only on a low level that I'd never notice, I'd rather just pick one of the other options.
