Murdered criminals have had all of their fingers lopped off. The digits are shown laying on the floor/ground and the fingerless hands are shown. Not a lot of blood shown, though.
A character is mentioned to have had an abortion at the end of season 2, when her medical records are accessed. It's hinted at in a previous episode as her "getting rid of a cat"
Someone refers to another character with learning disabilities as r****ded. It happens in the first ep of s4 but is shown again in the "previously" opening sequences.