Subject: Is it possible for a human body to be drained 100% of all blood?

I'm writing a screenplay in which the victims are found mysteriously with 0% 
blood in their body.  Although it turns out to be supernatural forces, I would 
like the audience to be led to believe it might possibly be a human.  
Is this humanly possible?  What would they look like...  How could you 
immediately tell?  could blood be drained with minor wounds, like if fish 
nibbled on the body in the water?  i'm not morbid, just a writer

Re: Is it possible for a human body to be drained 100% of all blood?