The region around exon 7 of the DAT1 gene was screened for Taq1 sites to determine if distinct individuals have significantly different genotypes. Regions were amplified by PCR and cut with restriction enzyme; gel electrophoresis was done to asses variability by comparing fragment. length. Results point to the conclusion that Taq1 sites are not responsible for individual variability within the region around exon 7 of DAT1 gene.