See http://www.dnacenter.com/international.html.
You can have a legal test done where the sample is taken in Santo Domingo and is analyzed in the USA. The procedure followed virtually eliminates the possibility of fraud.
You can have it done in Santiago at the Dr. Pedro Jorge Blanco Laboratory. Address: Avenida Juan Pablo Duarte #64, Santiago. Phones: 582-4012, 587-4158. This is the lab used by the lawyers in the Cibao region for DNA testing.