As of March 23, 2010, federal law requires employers to provide nursing mothers "reasonable break time" to express breast milk for up to one year after the birth of a child. While this break time is unpaid, there is no limit on the number of breaks that an employee may take for such purposes. The United States Department of Labor has not yet defined what a "reasonable break" is or what penalties may be imposed for a violation. There is a hardship exemption for employers with fewer than 50 employees. Usually an exemption is based on a difficulty or expense in relation to the size of the business and its financial resources, but it is not clear how it will be interpreted under this new law. Of course, this law does not preempt state laws that provide increased benefits. Additionally, as part of this new law, employers must provide a private place other than a bathroom for nursing mothers to express milk.