I am looking for anyone with information on if Vivitrol can cause a false positive result on a urinalysis. My husband received a vivitrol injection to help with alcoholism... 7 weeks later he had to take a urinalysis. It came back positive for meth, amphetamines, and methadone. He claims he has never used any of these and is blaming it on the vivitrol... I am having a hard time believing it. Any input?