Urine is the liquid waste product of the body that is excreted by the urinary system, and urine tests detect drugs used up to 36 hours before a given urine collection. Given these facts, which bodily system excretes a substance commonly used in drug testing among the following options:
- Evaporation
 - urinary system
 - animals
 - aqueous solution
 - cardiovascular system
 - opiate system
 - Integumentary system
 - sweating


 

  urinary system       