Norco is a prescription pain medication containing hydrocodone and acetaminophen. Hydrocodone is the main drug detected in the body. After a single dose, hydrocodone is usually detectable for about one to four days, depending on the test. Urine tests commonly detect it for two to four days, blood tests for up to twenty four hours, saliva tests for one to two days, and hair tests for u... https://medznow.com/how-long-does-norco-stay-in-your-system/