Go in person to the office of the prosecuting authority (State Atty, DA, Prosecutor). Bring your proof with you. Ask to speak, in person, to the attorney assigned to this person's case. If the answer you get is
"unavailable" ask for an appointment, if the answer is no, ask to see the person in charge. Same for the probation office, but they often take their lead from the prosecuting authority.
You can always go to Court for his hearing, ask the Clerk to inform the Judge that you have evidence to bring before the Court, bearing directly on the matter being heard. That will get the attention of the prosecuting attorney. Be prepared to testify.
The 2 kids living with him - if drug use is present while children are present, a call to CPS may be in order.
Old people may not live to see the collapse of our Nation. The rest of you may not survive the collapse.
A lie told often becomes truth. (Valdimir Ilyich Lenin)