A former factory cleaner alleged to have tried to “poison” colleagues by spiking office coffee with Viagra has been cleared more than five years after she was first accused. Karen Beale, described as someone who wanted to “help not hurt” people and with no previous convictions or cautions, was found not guilty today (Thursday) by a jury of seven men and five women. The 62-year-old had claimed during her three-day trial at Canterbury Crown Court that she had been “set-up”, suggesting one senior staff member found her “irritating”, and that the camera footage had itself been tampered with. The f…