14th Amendment. Grants citizenship to all persons born or naturalized in the United States; it forbids any state to deny any person life, liberty or property, without due process of law or to deny to any person within its jurisdiction the equal protection of its laws..
Asbestos is a fibrous rock that has been used as insulation for many decades now, both in buildings and in automotive brakes. Back around the 1960's, people began associating asbestos with cancer, and began banning its use in these fields. It was also used in industry, again, for its heat insulating capabilities.
If you are trying to remove the tile so as to save the cement board, it is a waste of time in my opinion. It is grueling work to try to remove ceramic tile in an effort to salvage inexpensive cement board. I feel it is a far better idea to remove the cement board and tile all at the same time. You want to start removing tile where the ceramic tile ends and a different flooring material, such as carpet or hardwood flooring, begins. Do not try to start this job in the middle of the ceramic tile floor.