A dentist on trial for poisoning his wife. And detectives' doubts about the case of a Virginia dad accused of conspiring with his au pair.

In Colorado, security video takes center stage at the murder trial of dentist James Craig. In the D.C. suburbs, a dramatic pre-trial hearing in the case of Brendan Banfield, accused of plotting to kill his wife and a stranger with the help of the family au pair. And verdicts for both former MLB…