You seem very guarded in answering the doctor as you think he works for the police.
You slowly begin to tell the doctor the details if he or she is reassuring and empathic.
SUGGESTED APPROACH Setting the scene Introduce yourself and start the station by thanking the patient for coming to see you. Enquire about reasons for seeking help, whether on his own accord or subject to a Drug Treatment and Testing Order (DTTO) or a Drug Rehabilitation Requirement (DRR). Explain that you will need to ask him details of his legal and illicit drug use and associated problems if any.