It is always a temptation to take short cuts. You may choose to paint over wallpaper either because you don't want to take the time to remove it, or perhaps the paper hides cracks and defects in the walls of your older home. Most professionals will suggest that you remove the paper because it may peel or the wall covering texture will be difficult to paint over.
If not detected early, children with high levels of lead in their bodies can suffer from: damage to the brain and nervous system; behavior and learning problems; slowed growth, hearing problems and headaches. Adults can suffer from: difficulties during pregnancy; other reproductive problems, high blood pressure; digestive problems; nerve disorders; memory and concentration problems; muscle and joint pain.