Iphone Texting App monitoring

Is there a way to monitor 3rd party Text Message applications to either a. see what is being written or b. Just to see the number of message sent? I ask this because I'm working for a client right now that wanted to monitor his employees text message output, as all he does is text and they get behind on the job. He found out his text messages were being counted, so he switched to a third party text messaging application. Is there a way to count or even monitor these applications?