Det Ch Insp Christina Barrett said the last confirmed sighting of Mr Roberts had been on Thursday, the same day it has been reported that he appeared in court.
The report, written last year by a senior officer at West Yorkshire Police, says that Ch Insp Riordan behaved as if he was "hell bent on cornering his quarry", that his attention had become "focused unhealthily" on Mr Watson and that this had the effect of "clouding his judgement".