Hi! I am a student and cannot risk my slight chance of failing a urine drug screen (processed at student health & sent to LabCorp), so have asked a good friend to substitute. She trusts that I wouldn't throw her under the bus, but she is concerned that the company/school could tell it was her urine and not mine. Can you help me find any information, other than my word, that would reassure her they just test for drugs, and not identity? Thank you in advance!