All laws are experiments to some extent – there are often uncertainties about how regulations might actually affect citizens and businesses in practice. Ex post evaluation helps to assess whether laws are working as originally intended and, if not, to propose improvements. Evaluations can highlight unforeseen technological and other changes that may render laws ineffective. Left unchecked, the stock of laws will continue to grow unabated creating unnecessary red tape for citizens and businesses. Evaluations also operate as an important check to ensure that laws are still justified and in the public interest. In turn, this helps to build community support for laws and boost trust in government action as it increases the level of transparency and accountability.