can anyone say "asbestos" and "lead"

Been watching various DIY shows on, well, DIY. I watched in horror as this one woman sanded the heck out of 100+ year old floors with old paint and glue on them. First, given the age of the house those loor boards sanded were likely the only flooring on the floor joists - not a good idea to sand much, if at all imho, because the floor is being thinned. If there is a sub-flooring underneath, as is done now, then thinning the floor boards only carries the concern of weakening the tongue and groove construction of the floor boards - not weakening the floor itself. Second, can anyone say "asbestos" and "lead"??? Without having the paint and glue professionally tested how did the crew know that there wasn't any harmful substances on that floor? I'm not THAT skittish about it personally, but professionally I will not sand such a floor. Too much EPA crap to worry about. Sure everything turned out okay and to my knowledge no one in the crew ended up in the hospital, but I think it was just irresponsible to show such recklessness in a nationally syndicated television show.