Short of CW2, the only real check on a rogue DOJ criminalizing medical practice and engaging in prosecutorial abuse is jury nullification. Prosecutors have to start losing cases when they go after doctors.
You are right. Dr. I went to high school with was arrested for prescribing to many pain meds. The feds seized his house, cars, airplane, boat, and all bank accounts and cash they could find. They also arrested his wife. He is now broke and has to depend on a public defender. His family is now destroyed and he has not been convicted of any crime.