It is difficult to identify whether someone is addicted to opiates. However, there are some signs that you can look out for, such as frequent use of opioid medication in a way that has not been prescribed by a doctor, using opioids even when there is no reason to take them, hiding medication from others, or hiding prescriptions in order to obtain more prescriptions or doctor shopping for prescriptions.

https://recoverypartnernetwork.com/drug/opioid/opioid-use-disorder