conjunctiva. A thin transparent mucous membrane lining the posterior surface of the eyelids from the eyelid margin and reflected forward onto the anterior part of the eyeball where it merges with the corneal epithelium at the limbus.
Its my understanding that Suboxone stays is in your system for at least 72 hours and has trace metabolites that can be detected in urine for up to 10 days (depending on strength and how long one has been on it).
The doses you took and duration of abuse are the other determinants. Moreover, the detection test and samples used also determine if the medication is present in urine, blood or saliva. Many people are eager to know how long Suboxone stays in their system. Most probably, they do not want to test positive for the medication.