I was looking at one school's HR page about the School Nurse and it said must be certified by Texas Department of Health to conduct vision and hearing screening.
Under Maryland law, a child must be at least eight years old to be left alone in a house or car. State law also says a child must be at least 13 years old to baby-sit another child. Generally, it is left up to the parent to decide whether a child who is at least eight is mature enough to be home alone.
Legal Age for Children to Stay Home Alone: Guidelines . Most states do not actually have an official legal age for children to stay home alone. Only a few have set legal guidelines: Georgia - 9 ; Illinois - 14 ; Maryland - 8 ; Oregon - 10 ; However, many states have guidelines officially listed and encouraged by various child protective agencies: