The other issue concerns employee use of employer owned systems. There have been cases where employees have been prosecuted for violating a purely civil agreement between them and their employer about the systems they have access to.
In general the law should not criminalize a civil contract violation or in the case of EULA's and Acceptable Use policies, it is questionable whether they are even valid contracts. This is especially true when the law in question is very one sided in favor of big companies using the threat of prosecution against researchers and employees and customers. I can't get the FBI to prosecute Comcast for turning on their public Wifi network on my router, even though it does potentially violate the CFAA.