brillohead, ADN, RN 1,781 Posts Specializes in Cardio-Pulmonary; Med-Surg; Private Duty. Has 5 years experience. Nov 8, 2016 I work on a general medical / cardiac / pulmonary unit. While collecting urine recently, I had a patient ask if she could sign saying that she did not consent to a drug screen, but could we do a pregnancy test for her while we were at it?She did have a UDS ordered (and pregnancy and urinalysis), and I told her that she couldn't refuse the drug test, but that we didn't do anything with the information other than treat her medically -- we don't send it to the cops or anything like that. If we're going to be giving her medications, we need to know what we're dealing with, and that's the reason for the test. In order for a drug screen or blood alcohol test to be legal for court purposes, it has to go through specific chain-of-custody requirements, and tubing a container of pee to the lab doesn't meet that criteria at my facility.