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if the ceiling is covered with drop ceiling and peeling paint is covered up then it is safe. It is impossible to remove lead paint from walls and ceilings unless completely demolished.
If the ceiling you are talking about, is that "popcorn" ceiling; they didn't use lead in that.
That popcorn stuff is easy to take off; just spray it with water, and scrap it with a wide trowel. You may have to texture it afterward; but it is worth it.
Good luck and may God bless