"Just cause I'm taking someone in doesn't mean they've been found guilty, key thrown away. I don't stop digging until I've got proof beyond my doubt." It's a matter of pride. He won't let anyone best him, and having the wrong person for a crime? Is letting someone else win.

He stubs out the butt of his cigarette and debates lighting another. "Hopefully won't be anything needs arresting someone. Not for a few years."