They are charged under the states compulsory education law, §22.1-254, which says parents have to send their kids to school for the same number of days and hours per day as school is in session.
So, if a child is sick, and misses 2 days of school, the parents can be charged with a crime.
Nice.
Two words: "Common Sense".
Ah, forgedaboutit - you're a conservative....