Extracting iMessage log from phone/records

My wife received a ticket for voice texting (in California), despite the July 2012 change in the law to permit texting using "voice-operated, hands-free operation" (see law, below). Citing officer, however, would not listen.

To challenge the ticket, I wanted to demonstrate that in fact no actual text message had been sent (SIRI was acting up that day). From the AT&T bill, it's easy to see no message has been sent. But from the iMessage side, I realize there's no definitive list of iMessages sent or received -- OR IS THERE?

Is there any way to obtain (through Apple or otherwise) a complete list of actual iMessages (or just their date/times)? (Even technical approaches -- I'm an Apple Developer)

Stephen
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SECTION 1. Section 23123.5 of the Vehicle Code is amended to read:

23123.5. (a) A person shall not drive a motor vehicle while using an electronic wireless communications device to write, send, or read a text-based communication, unless the electronic wireless communications device is specifically designed and configured to allow voice-operated and hands-free operation to dictate, send, or listen to a text-based communication, and it is used in that manner while driving.

(b) As used in this section “write, send, or read a text-based communication” means using an electronic wireless communications device to manually communicate with any person using a text-based communication, including, but not limited to, communications referred to as a text message, instant message, or electronic mail.

(c) For purposes of this section, a person shall not be deemed to be writing, reading, or sending a text-based communication if the person reads, selects, or enters a telephone number or name in an electronic wireless communications device for the purpose of making or receiving a telephone call or if a person otherwise activates or deactivates a feature or function on an electronic wireless communications device.