Was Gaff a replicant?

I am pretty sure he's human. Gaff was sent to watch Deckard's behavior and knows so much about Deckard because he read his file and possibly his own memories were used as the source for Deckard's implanted ones. He let them go, because he IS human and took pity on them. The unicorn is a reference to Deckard, and to his unicorn "dream" as well. So Gaff seems to know Deckard's inner thoughts, suggesting the "dream" would actually be an implanted memory or image. This strongly suggests Gaff knows Deckard's [implanted] memories, just like Deckard knew all about Rachael's.

Gaff seems to be the latest debate on who is a replicant. He is a great character, one of my favourites. Throughout the movie Gaff is always watching, waiting to see how things unfold. Maybe it is because he wants Deckard's job or more likely he knows that Deckard is a replicant and thus keeps tabs on him. My personal opinion about Gaff is that he is human. Deckard has fallen for Rachael because of his emotions and his realization that he is a replicant. Gaff lets Rachael and Deckard go because he is human. Gaff could have retired both Rachael and Deckard, making him the "chief Blade Runner. But he lets them go. Why? I would like to think that the gesture is one of human compassion.... This is what makes Blade Runner a great film. Many aspects of the film make fans question what is going on. Endless debates. Fans have taken ownership of the movie.....