He'd be wasting his time.

The only crime the cop committed is misuse of government property. In the extent he used it, it isn't so serious. How do you know if the wife didn't lie to him to coax him to inquire information? Even if the cop knew everything, he isn't the one harassing him. He is simply an accessory.

If anything does happen, he'll get a hefty fine, suspended or put on probation. In the scope of things, this isn't the kind of thing regulatory agencies would be up in arms for.

If you feel harassed, you better off calling the police.