I have noticed many SNPs that are not validated. Why doesn’t dbSNP purge these SNPs?
Currently, dbSNP does not unilaterally remove SNPs that are not validated. We will, however, process a submitters’ withdrawal request if they later find their submission to be an artifact. dbSNP also does not remove “un-validated” SNPs since it is possible that a SNP derived computationally may later be successfully genotyped by another lab. If you are interested in using an SNP for your research, you should first make an informed decision about the usefulness of the SNP by reviewing the validation status (found on the refSNP cluster report) and detection method (links for available detection methods can be found on the submitted SNP detail report) of the SNPs under consideration.