Consumer Protection Law
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The detective would not play any role in issuing a title from the DMV, the original of which would not have his modification. So the detective can modify it by making notes on a print out for whatever purposes he wants, but the print out would be inadmissible as the actual title, which would require the original as best evidence.
If this isn't helpful please reply here on this question thread to explain how this situation arose and I will consider my answer again in the light of your response.