Policy and Systems Change
Sometimes the advocacy goal is not a new or amended law, but rather improved implementation of a law, a shift in public policy, government policy, or even a shift in the way the government operates. Advocacy on the policy level may target change at a national level or at a local level. The former would likely target those making the law, whereas the latter would more likely target those responsible for enforcing the law. 
An example of advocacy at the national level is the Recommendations for Fighting Human Trafficking in the United States and Abroad Transition Report for the Next Presidential Administration by the Action Group to End Human Trafficking and Modern Day Slavery, 2008. The Action Group is comprised of: the Alliance to Stop Slavery and End Trafficking, Coalition to Abolish Slavery & Trafficking, Free the Slaves, International Justice Mission, Not For Sale Campaign, Polaris Project, Ricky Martin Foundation, Solidarity Center, and Vital Voices Global Partnership. These organizations worked collaboratively to analyze the existing human trafficking policies of prevention, protection, and prosecution and made recommendations for improvements to the Department of Justice, the Department of State, USAID, the Department of Labor, the Equal Opportunity Employment Commission, the Department of Health and Human Services, Homeland Security and Immigration and Customs Enforcement, and the Department of Defense. These recommendations were made in November 2008 to President-Elect Barack Obama.
An example of advocacy at the local level is the effort to encourage law enforcement to adopt "probable cause" arrest policies. These policies enable police officers to make arrests for misdemeanor level domestic assaults without directly witnessing the crime. See: Law Enforcement Reform Efforts, StopVAW, The Advocates for Human Rights, 2009.
An example of advocacy to improve the implementation of laws is the St. Paul Blueprint for Safety, an inter-agency reform effort that focuses on the responsibilities of criminal justice agencies in protecting victims of domestic violence. The Blueprint includes specific guidance for every agency, including what victims need to be safe, what workers need from each other to do their jobs, and what is required by each worker and agency to hold an offender accountable.  See : Case Study: St. Paul Blueprint for Safety, www.stopvaw.org.