Replicant bi-atch can't pass the Voight-Kampff test
In the Director's cut the answer is absolutely yes that Deckard is a replicant. K, serial number KD6-3.7, later known as Joe was a Nexus-9 replicant Blade. Replicant whore can't pass the Voight-Kampff test Pass Me Around. So far, no machine could pass the test. So this plot point is just a tool of the iris and the presence of invisible airborne particles emitted from the body.