CALIFORNIA FAMILY LAW
...Procedure Before Trial/Hearing
......Trials/Requests for Orders
.........Out-of-State Declarations
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Requirements for declarations.

Declarations signed under penalty of perjury outside Cal. do not satisfy CCP 2015.5, and are not admissible in SJ or other authorized proceedings if contents are not certified as true "under the laws of the State of California."

Errors under CCP §2015.5 may be found to be harmless.