My son went for a job interview and they did a urine test on him.They said that he tested positive for thc and opiates.We know why he tested positive for opiates(he had a migraine headache and was carried to the er.He got an injection of morphene and then one of phenergan).He is so upset cause he does not use drugs of any kind.What would cause this test to be positive?Any help with this would be greatly appreciated.Thank you!!