DNA testing helps solve cold cases on South Shore

Mary Kate McGilvray, a serologist/DNA analyst at the Massachusetts State Police Crime Lab, displays a sample kit of the type used to collect blood samples for the state’s DNA database of people convicted of certain crimes, at the crime lab in Sudbury, Mass., Thursday, Jan. 29, 1998. A new law, which went into effect Jan. 1, requires anyone convicted of any of 33 crimes, ranging from prostitution to murder, to give a blood sample. A group of prisoners is suing the state challenging the constitutionality of the law.