However, it has been the experience in many countries that acts of violence against women are not investigated thoroughly or documented precisely, and that domestic violence continues to be regarded as a private matter and not a criminal offence, while complaints of sexual violence continue to be treated with scepticism. Experience has shown that the establishment of such units may facilitate the development of expertise in this area and may result in an increase in the number of cases investigated and a better quality and more efficient process for the complainant/survivor. However, in some countries, experience indicates that establishment of such units may result in the marginalization of women’s issues.