'I worked in Tenerife and discovered its dark drug underworld - tourists should stay alert after Jay Slater's disappearance'

'I worked in a Tenerife bar and there's a dark underbelly to the island - people going there should stay alert'

As the search for missing 19-year-old Jay Slater continues, Ciara O'Loughlin, who worked in Tenerife when she was 20, says the..