"Turn out most of the lights on the set so that the 'investigatin' is done mostly in the dark....."
"Keep eye contact to a a minimum..."
"Have the forensic science people interact with suspects...."
Exactly. I used to watch CSI fairly often, but now whenever it comes on, my husband and I scream, "Turn on the lights!" in unison and switch to something else. I didn't used to be such a stickler for verisimilitude.