Interesting article on the use of technology by spouses and parents involved in family law disputes. It is extremely important to note that anyone even considering such things tread very carefully. There are significant criminal and civil sanctions in Virginia and prohibitions on what you and your lawyer may or may not use from a legal and ethical standpoint. Often the use of some of these spy devices is not worth the potential consequences you could face for violating laws. In trying to achieve that sense of "Gotcha!", you may be the one who is more seriously penalized.
http://professional.wsj.com/article/SB10000872396390443995604578002751421246848.html?mg=reno64-wsj
