Surveilled doesn't come into play here. The text messages were ordered to be disclosed and the people involved complied. It doesn't matter that the conversation

Surveilled doesn't come into play here. The text messages were ordered to be disclosed and the people involved complied. It doesn't matter that the conversation was encrypted, if you have a record, you have to turn it over. Using a messaging service that automatically deletes old messages might be a way to avoid it.