How did the doctors talk David lacks into allowing them to take cell samples from Henrietta?

Answer 1

Although the doctors had already taken cells, when Henrietta died, they did ask for permission. Mr. Lacks initially wanted to refuse, but the doctors said that studies of Henrietta's cells could possibly benefit family members in the future. Then Mr. Lacks agreed and gave permission.

Answer 2

No one was asked for permission to take cell samples from Henrietta Lacks. During the course of her radiation treatment for her tumor in 1951 two samples of her cervix were removed without her permission. Those cells eventually became the line used in biomedical research.