Police searching for the missing mum have come under criticism from a number of former officers, who say it was wrong to assume that she accidentally fell into the River Wyre.Martyn Underhill, a former Sussex Police Force detective who was a senior officer in the Sarah Payne murder investigation says Lancashire police were wrong to rule out foul play so quickly.READ MORE: New Nicola Bulley mystery as husband begs Mercedes to track missing car keysReferring to the spot where Nicola’s phone and dog lead were found, he said: “That bench on that river in my view should have gone to a forensic laboratory.“If Nicola had been attacked there could be blood spatterings on it,” he pointed out.The fact that the bench still remains in place, and has become a place of pilgrimage for well-wishers and amateur detectives, is “questionable to put it bluntly,” Martyn added. Martyn's words were echoed by former Met Police detective Simon Harding, who wrote in the Sunday Times: "You would expect the area where Nicola was last seen to be cordoned off… to stop people descending on it as a tasteless tourist spot and trampling the area — losing any potential evidence”.