I know NYPD Blue always puts a warning on (mainly for language and semi-nudity), and they are on in the 10 p.m. slot. I think The Shield has the same warning. Can't recall if CSI: Miami puts a lot of warning on their episodes (highly dependent on the episode itself). Survivor had to put a...
The look on Sam's face when she realized that she had to deal with a hostage situation and draw her gun seems to recall her reaction to being held hostage herself last season, and using her weapon in the line of duty. I didn't remember a warning in front of the episode (surprised to see the...