Replicant vs human question

Bit of a Blade Runner novice here, so excuse me if this question seems obvious to those who know this film well.

So without any further ado, what, if anything, would you say points to Deckard being human? It's been a while since I've watched Blade Runner, and last time I saw it, I took it at face value that he was human. Yeah, I know, it could be said that taking it at face value would lead one to think he was a replicant, so I guess what I mean is that I went with human because that's what worked for me.

To be sure, it seems like the movie encourages you to make up your own mind on the subject, but it also seems like there's a lot there pointing to his being a replicant. As a matter of fact, I can't think of one friend who's a fan of BR who doesn't think he's a replicant.

Like I said, it's been a while since I last watched BR, but I do recall some of the hints that Deckard is a replicant. What I don't recall at all is if there's anything that observant fans would point to as a sign (or proof) that he's human.

Thanks in advance for any input.