I don't closely follow this show, but this week's episode (Bad Blood, Season 9 Episode 13) was captivating for me as an ex-JW. One of the story lines centered on a 19-year-old boy whose family is JW (but he is obviously a fringe JW) - brought into the emergency room after a serious skateboarding accident by his friend who was totally unaware he was JW.
The episode summary along with a "watch this episode" link is linked below.
I found most of the JW storyline quite realistic (except for a "we believe prayers can yield miracles" quote from one of the JW's - I think it was the mother). After the parents refused a blood transfusion for the boy, the resulting chaos and philosophical arguments were riveting to watch.
http://abc.go.com/shows/greys-anatomy/episode-detail/bad-blood/1062764?page=1