If people are lying about you at work, your boss may still have to take the accusations seriously. But if everyone is lying about you anyways, it doesn't matter whether they take a blood test, they will still have "made a case" that you broke policy and they did not descriminate. Licensing agencies, howeverm usually have stricter rules about proof. Definitely locate a lawyer or employement advocate. does your work give you access to advocacate or arbitrater? they can be a great help also