incorrect - if you read the actual state law it included soiled mattresses:

Mattress means any resilient material or combination of materials that is enclosed by ticking, used alone or in combination with other products, that is intended for sleeping upon, except for mattresses that are contaminated with mold, bodily fluids, insects, oil, or hazardous substances. Mattress includes any foundation or box-spring. Mattress does not include any mattress pad, mattress topper, sleeping bag, pillow, car bed, carriage, basket, dressing table, stroller, playpen, infant carrier, lounge pad, crib bumper, liquid or gaseous filled ticking, including any water bed and any air mattress that does not contain upholstery material between the ticking and the mattress core, and mattresses in futons and sofa beds.