[Dantilla]

Previous owners failed to disclose a known defect. That's a no-no. They could be in deep doo-doo.

Stripping the sheetrock, spraying the framing with Kilz, or a similar shellac-based product, and hanging new drywall may be what's necessary. The old sheetrock is now contaminated waste, and should be treated as such in order to keep out of trouble. It would be tempting to play dumb and just haul it to the dump, but if caught, the penalties would be big.

Here in the Northwest, there are companies that remove meth-infested waste. If you hire someone to take care of it, you will most likely not be held liable if things are not handled properly.

Best case? Hire a pro, and have an attorney hand the bill to the previous owners.