My friend's wife suffered a back injury 5+ years ago.

[no_hypocrisy]

She had surgery, which exacerbated her condition.

She suffers from unbearable pain and is dependent upon a cane and a wheelchair.

Because of the restrictions to access to opioids, she now is addicted to unregulated and illegal street meds that her adult son buys for her. She can't endure without them.

Here's the thing: She wants to undergo yet another surgery for her back. It's experimental and not guaranteed to ease her pain or allow her to walk again.

Here's my question: She's on illegal opioids but most likely won't tell the surgeon about it. Is it safe for her to even go under anesthesia with her system awash with opioids? Or would routine pre-op blood tests reveal the opioid use?