He became a national figure after the deadly attack on police in July, but now the Dallas Police Chief is stepping down. Our conversation with the city’s mayor, we’ll explore. Also It’s been hard to track shootings involving police, but it’s recently gotten a little easier in Texas, we’ll explain. Plus Labor Day boaters beware: a marine menace could try to put a damper on your holiday fun. And relatively small pieces of hardware could cause big problems on offshore oil rigs, and the issue could extend on land. And embracing the data. Why some say we should let go of privacy concerns and enjoy all the tracking technology does.