Morphine

I plan to go back to nursing and finally make use of my usrn license. Unfortunately, i battled cancer, and though i am now in the clear, the 1st surgery gave me unbearable pain that the 2nd surgery was not able to repair. So i take morphine everyday to manage the pain. My brother who works in the US said that i might not be hired as US hospitals are very strict with nurses who take morphine, and that if ever i do get hired, it will be as a clinic nurse and not in a hospital setting. I just want to ask if this is true or if anyone has encountered a similar experience. Thank you.