“Tracker” is back, and so are the hit CBS drama’s viewers. The Justin Hartley starrer returned on Oct. 19 with 12.97 million viewers, according to Nielsen’s live+7-day multiplatform data. That was up 17% from the year-ago…

“Tracker” is back, and so are the hit CBS drama’s viewers. The Justin Hartley starrer returned on Oct. 19 with 12.97 million viewers, according to Nielsen’s live+7-day multiplatform data. That was up 17% from the year-ago…