The materials of that era are predictable. Popcorn and other textured acoustic ceilings, which the mid-century remodel almost always wants gone. Joint compound in original drywall. Nine-by-nine floor tiles and the black mastic beneath them, frequently hiding under two or three generations of later flooring. Insulation wrap on original ductwork. Certain roofing and exterior products. And the reassuring truth that comes with the list: intact, undisturbed material in good condition is generally not the emergency people fear, and much of it is managed in place rather than removed. The danger is disturbance. Sanding, scraping, cutting, tearing out. The lab result is what tells you which materials your project can touch freely and which ones need professional handling first, and nobody, including us, can tell you by looking. Laboratory analysis of properly collected samples is the only answer there is. The rule extends to restoration work, not just remodels. When our water damage restoration in Scottsdale crews work an older home and the drying plan calls for removing material, testing comes before the cutting, every time. Solving a water problem by disturbing asbestos-containing drywall trades a bad week for a bad season, and a careful contractor never makes that trade.