Dr. Elizabeth T. Gershoff is a scientist who studies spanking. She says that research done over many years shows that spanking does not work. She says that spanking does not teach children good behavior or to obey their parents. She says that children who are spanked obey their parents less as time goes on. Dr. Gershoff said that spanking is "violent" and should be stopped. In 2012, a group of Canadian scientists also looked at many years of research and found that spanking does not work. They said that over time, spanked children become more aggressive. Murray Straus is another scientist studying spanking of children. He has said that there is new research showing that spanked children commit more crimes when they grow up. He said that this was so even if their parents were "loving" to them.