How Long Does Fentanyl Stay in Your System? Detection & Risks
But since fentanyl fold much of the fentanyl supply has become exponentially more powerful than heroin, the slouching effect is most pronounced with fentanyl. Saliva tests can detect fentanyl for approximately 1 to 3 days, similar to blood tests, but they are less commonly used and may not be as reliable for opioids compared to…