How long is marajuana in your saliva?

Up to 15 weeks: Depending on the duration of use, and the sensitivity of the detection method, the test may be positive for up to 15 weeks.

Approx 24-48 hrs : Thc does not stay in the saliva very long. Various tests have different sensitivities and the range of detection depends on the test sensitivity. Some reports indicate 6 hours, others 24 hrs and still others 48 hours. I would ask which test method is being used for more specific information.