Jennifer Rice: Should you check your childs personal emails or text messages?

This was another pedophile who, unfortunately, was a elementary school teacher. She was viewed as nice to her students generally speaking, but apparently also liked sending the kids emails and took an 11 year old boy on a date to the movies. The parents found out and tried to step in, to which she kidnapped their son and assalted him while on the run. Later details included that she had been involved with the boys elder brother too.

She was sentenced to 25 years.

In your opinion, is it ever ok to view your childs personal messages of any kind?