[header] How to sue for false allegations [title] Document the false allegations. [step] Beyond the allegations themselves, as soon as false allegations surface you should start keeping records of everything you do and every conversation you have. [substeps] It may seem like overkill, but you never know when something in your careful records can serve to disprove the allegations. 
Buy a bound notebook so that all of your records are together in one place. Make your entries chronologically as soon as possible after the conversation or event occurs.