How can the zoo prove if you are members of the same household?

My best friend and I want to get memberships to the San Diego Zoo. But why buy 2 individual when you can get one dual membership for a lot less. The only thing is, the website states it has to be 2 adults of the SAME household. How are they going to prove that? Does anyone currently have a dual membership and how does it work? Do you always have to be there together? And are they really going to check your ID's to make sure the addresses match?
 
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