As I read New Jersey's statute, unauthorized computer access can only result in a petty disorderly person's offense at the most (a $500 fine), when there has been no demonstrated disclosure of data to others and/or where there is no demonstrated economic damages resulting from the access.
The disorderly person offense would be with proof that the computer was, in fact, accessed without authorization or in excess of authorization. If this is a "family" computer we are talking about here (is it, jsmjr?), it would be more difficult for jsmjr to prove his wife did not have authorization to access any and all files on it.
To be more than a disorderly person offense under New Jersey law, then, jsmjr would have to show that his wife knowingly and without authorization (or exceeding authorization) accessed or attempted to access his computer, with her purpose being "a scheme to defraud" or obtain services, money or property from jsmjr. In addition, jsmjr would need to show actual damages of at least $200 (up to more than $75,000). Accessing the computer under these other circumstances would fall under New Jersey's "computer-related theft crimes" and result in more than a disorderly person offense (ie. misdemeanor in other states).
So, it really doesn't seem to matter, does it, how the data was accessed (under federal or state law) so much as what the purpose of accessing it is and/or what is done with the data once it is accessed? Or am I missing something fundamental here with the "access" part of it all?
At any rate, I agree with CavemanLawyer about prosecution in this matter.