INVESTIGATION: On the line - a family business

<p>Part one of a five-part special investigation into county lines drug dealing, running in audio, video, print and digital from The Times and The Sunday Times.</p><br><p>Today we reveal how police took down the family controlling the drug trade in one British city, creating a power vacuum that was filled by a new breed of violent, criminal operation - county lines.</p><br><p>The Sunday Times' northern editor David Collins is given unprecedented access&nbsp;to North Yorkshire Police as they fight back against the drug …