If you're not sure you could always write "he's not a dishonest man". As for a hospital, it's a big building with patients, but that isn't important right now...

I sometimes tussle slightly with what's the best way to write possessives. In speech I'd be talking about Jesus's miracles. But should I be writing Jesus' miracles? If I'm not sure I do the Mr Red thing and default to writing it the way I say it. Of course, I could always circumvent it by altering the construction. Coward!