I worked with an ex-computer-forensics guy for two years. He only lasted 18 months in the role.
The technical aspect is only a small portion of the role, looking at images of kiddie porn or kids being abused, bestiality or other sick stuff, then having to keep calm and cool in court is what is really difficult.
Some of the stuff will be quite nasty, we're talking infants being "abused" here. Think you can look at that stuff without flipping your lid?