Based on my opinion, I am of the belief that when two partners live together whether married or not, you have the right to know what is going on in your relationship as much as you have the right to your own privacy.
Accordingly, your partner or spouse has the same rights. If something goes wrong with our product, do we not investigate it?
While most of the information you find is completely opinionated ( as will mine be), there is a fact or two one should know, and those are: Even if you are married, your spouse still has the right to privacy by law.
Likewise, you can violate the privacy rights of your spouse in several different ways.
I would urge anyone that takes this method to proceed with great caution when it comes to snooping or spying on their spouse or partner.