Depends on the state. Reusing mattresses is not permitted in California, unless the mattress has undergone a sanitization process that often costs as much as the mattress is worth.
Concerned with paying lip service to health and safety (and maybe create an extra regulator job or two)? Sure. But at some point, labeling everything as cancer causing takes away any meaning what so ever. I think California labels something every week as cancer causing. It's just become noise at this point. Here's the latest now for ya: Coffee https://www.usatoday.com/story/money/2018/03/29/coffee-cance...
Have you ever worked hospitality?