Medical test reveals British father's son was switched for darker-skinned baby just hours after his wife gave birth in El Salvador hospital - then sold by people traffickers

Richard Cushworth and his wife Mercedes Casanellas welcomed a son at a hospital in San Salvador in May this year, but say they immediately noticed that something was wrong. The couple, (pictured right with the 'swapped' child and left with their biological child) who live in Dallas, Texas, waited three months before they took a DNA test - which proved the child handed to them by hospital staff has a 0.00 per cent probability of being related to either of them. They now fear their light-skinned baby was snatched deliberately by staff at the exclusive Ginecologico private hospital in the country's capital San Salvador to sell to child traffickers. Ms Casanella's obstetrician-gynecologist, Dr Alejandra Guidos, who the couple accuse of masterminding the plot, was arrested on Thursday. The country's Attorney General has now ordered a criminal investigation into the baby's disappearance amid claims a trafficking gang, led by Dr Guido, has been operating inside the hospital. Ms Casanellas said: 'I just want him to give me my baby back.' The couple said that if the true parents of the baby they were given are not found, they will raise him as their own.