We feel sorry for this situation, but to make sure that where your husband when he says that he is at work or away on delegation - just stock up on a smartphone with android system, get him our application and set up an account on a free service spysat.eu . The phone can be permanently mounted in the car. If your husband has auto brands mentioned next, you will find detailed instructions on how to do it, if not, you can ask the person who knows the basics of car mechanics, namely electrical issues that helped you.
Another solution is to install the application on your husband. However, please check if such action is consistent with local law.