Choosing a sperm donor can be legally and medically risky. Even if the laws of the state cut off parental rights for a sperm donor, the donor might make a legal challenge if he knows who his biologic child is. These challenges can be very disruptive for the child and the legal parents. Friendships and family relationships are easily strained by conflicts that arise over custody and the raising of children. Artificial insemination may also be medically risky if the sperm donor is not rigorously screened for both genetic and communicable diseases. If the physician procures the sperm, it will be difficult to avoid liability if the mother or the child is harmed by a discoverable condition.