Touche.*its
I frequently go over past patient reports and reuse anything I can to save time (which equals making $$$). I discover past mistakes here and there. If I had to put a number on it, I'd guesstimate that out of every 100 pages I type (and that's character count based pages) there are probably 5 to 10 total mistakes of that nature made, i.e.: its/is, an/a, the/there, this/his. It's never critical things like lab or test results, messing up patient or doctor names, it's petty shit. Spell checker doesn't pick them up

Fortunately for me, people don't normally read every single letter in every single word in every single sentence.