Would you ever give a client money? I believe that the answer to this is no and the reason is that it crosses a professional boundary

I agree the answer should be no, but you could probably expand that and offer to refer them to a case manager or social worker to assist with finding programs to help the patient.

The straight up answer is "No, I wouldn't give the client money, but I need more information about this client to help them". The reason: You assume that this person wants money to buy drugs, but they could be facing a true financial hardship, so you don't want to just write them off as drug-seekers. But you need this client's history, including their mental health history. And you need to ask some clarifying questions to re-direct this person to the right resources if they truly have a financial need (could be homeless, etc. etc.). Then, when you call the case manager, you will have a better handle on what the client needs from them.