Sorry, but Rick Deckard is human.
There is no indication by Philip K. Dick that he was an android.
Also, it is very clear in the book that Rick Deckard has sex with Rachel, as it is very difficult, if not impossible, for an android to turn off the sex drive once stimulation has occurred.
I was confused for years about this issue, but after listening to the Blade Runner audiobook several times, I'm just going to say that Rick Deckard is human.
In the book, there is a bounty hunter who is an android, but it ain't Deckard.
