The Australia Taxation Office is a formidable enforcer with extraordinary powers.It can raid your home or business without a warrant, it can compel you to answer questions and treat you as guilty until proven innocent.While there's strong public support for a crackdown on major multinational corporations to force them to pay their fair share, there is growing concern that the Tax Office is targeting people a long way from the big end of town.In a major joint Four Corners/Fairfax investigation, reporter Adele Ferguson puts the actions of the Tax Office under the microscope, examining how it uses its extensive powers.