UCL "unlawful" prong hypothetical

A reader writes in with the following question:

Can a California plaintiff assert an action against a California defendant under the UCL based on a violation of another state's laws? According to the 17200 Rutter Group treatise, this is an open question. I believe it would be possible in the proper circumstances. But, I would be interested in seeing if there are any trial court decisions around the state that opine on this issue.

What do you think?

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Daily Journal article on "no class action" arbitration clause decisions