The article furnishes about 25 authentic examples of double passive marking in Turkish possibility verbs. Double passive marking in verbs not marked for possibility and possibility verbs with a passive marker after the auxiliary (instead of before it as in the standard Turkish grammars) as well as some examples where passive marking occurs only after the possibility morpheme are studied. The examples are discussed against the backdrop of an innovative theory which involves an opposition of an internal and an external circle of referents. As a result, a semantic interpretation is offered for these morphologically special cases of the Turkish voice system. Material from older stages of Turkish (Ottoman) as well as some other historical and living Turkic languages is also discussed.