WhenWhen can statutory rape charges be filed who files them?

WhenWhen can statutory rape charges be filed who files them?
My son is 16 his girlfriend is 21 he got in trouble with juvenile probation while they were together he had to go away to 45 days of treatment and now um is facing up to a year in youth services are juvenile detention she will not leave him alone messages him constantly and keeps him stirred up constantly and is now talking about getting pregnant and then having a child how do we pursue some statutory rape charges on this girl

Justin’s Answer
If you feel that a crime is being committed you can always call the police. Based on what you’ve told me, this does qualify as statutory rape in Missouri.