The real science is that asbestos filaments have been found to cause Lung Cancer. Those applications that use asbestos as a larger percentage of the product are found in building materials, automotive (brakes), ships (insulation), etc.. The Lawyers that spend the money to link asbestos to those products found it to be a huge money makers and elected to continue to target any product that may contain even very tiny amounts of asbestos were than targeted with very weak to no science. But, with the reality of spending years in courts, all corporations simply contributed to the vast pot of money for the Lawyers and changed their products.
True science: The rock formations of Talc contain very tiny amounts of asbestos as does several other like rock formations used in other products. Although, there is linkage in products either made from or have a percentage of size of asbestos added to them are linked to Lung Cancer. No another form of cancer has been proven as of this date.
Johnson and Johnson made the choice and switched to Corn Starch, which as stated above has problems of its own, but that is another story and the balance of the market has joined them. Today, near all makers of Baby Powder have switched to corn starch. There are still some, a few Black Market sources for Talc based baby powder, but they are quickly disappearing