Send their parents to jail. Because 12 year old kids cannot probably be prosecuted like adults, then you have to prosecute the ones that are responsible for their actions.
SOMEONE has to rot in jail for this kind of false testimony, you can imagine what kinds of trouble that nomad went through in the prison for being charged of molesting 3 childs. If 12 year old kids cannot be held liable, then they cannot testify IMO.
Sex charges are the witch hunts of our times, because they require very little (if any) hard evidence. Just one biatch saying you raped her is usually enough especially if you two have been seen together. Rape has gotten some very special treatment from our society, because the women have got status of being equal to the men, but at the same time being innocent dummies that must be protected with bias.