Urine drug<unk>  (UDS / UTOX) is typically ordered in trauma, psych, and altered mental status patients where there results can assist inpatient management.
Cooperative psych patients do not require Utox as part of the ED<unk>  (unless local policy dictates)
Routine testing of activated traumas is reasonable, but discretionary testing of nonactivated traumas should be adopted
Unlikely to have any significant impact on the management of ED patients
Drug testing alone never significantly better than history
Appropriate in pediatric altered mental status workup, determining brain death, management of psychiatric disease (dual diagnosis treatment), and in trauma victim patients (substance abuse counseling).
Urine toxicology screen
HIV testing 
Mini mental status exam
Six item screen
Urine analysis
Liver function tests
CT brain interpretation
Fundoscopic exam