Why the sample matters
Gypsum board, joint compound, tape and wall texture are different materials and can give different lab results. How samples are taken, and whether the layers are analyzed together or one by one, is a decision for the inspector and the lab, and the report should say which was done. Ask for a report that lists each sample location, so you know which walls are clear.
A clear result on one wall does not clear the whole house when other walls were finished at a different time or repaired later. Additions, a converted garage or a wall patched after a leak are worth their own samples.
If the same rooms have textured ceilings, see popcorn ceiling removal; for walls inside a full room remodel, see kitchen and bathroom remodels. All services are on the Plano Asbestos Removal homepage.