The officer is completely right. A license to go back and forth to work is a license to go BACK AND FORTH TO WORK ONLY, not take a detour to dad's house because at that point, he's no longer going back and forth to work. He went from work to dad's house and then dad's house home...

His option was to have his wife go get what he needed or have his dad bring him what he needed or have someone go pick it up for him or his wife to drive him. See? All kinds of options.