One way you can try to obtain such information is by submitting a Public Records Act Request, pursuant to the California Public Records Act, to the subject agency/entity. Below is a link to a sample letter.
Ms. Berjis is licensed to practice law in the State of California. The laws of your jurisdiction may differ and thus this answer is for informational and educational purposes only and is not to be considered as legal advice. Since all facts are not addressed in the question, this answer could change depending on other significant and important facts. This answer in no way constitutes an attorney-client relationship.
I am at a loss at how the police can take a vehicle registered in your name and not your husband's name (presumably titled the same way) and then return it to someone who is not the owner, and claim that you are not entitled to get a copy of the report. Under the facts as I understand it they have committed a theft of your vehicle, unless it is titled in your husband's name and somehow registered in your name. You should spend some money to buy an hour of an attorney's time to see if the attorney can get to the bottom of this and get your truck back.