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ALBANY — New York is poised to establish one of the most expansive DNA databases in the nation, requiring people convicted of everything from fare beating to first-degree murder to provide samples of their DNA to the state.

On Tuesday, Gov. Andrew M. Cuomo and state lawmakers were putting the finishing touches on a deal to establish a so-called all-crimes DNA database, a move that is supported by all of the state’s 62 district attorneys and 58 sheriffs, as well as 400 police chiefs. New York already collects DNA from convicted felons and some people convicted of misdemeanors, but prosecutors say collecting DNA from all people convicted of misdemeanors will help them identify suspects of more violent crimes, and, in some cases, exonerate people wrongly accused.

“Every single time we’ve expanded the DNA database, we have shown how effective it is in convicting people who commit crimes, and we’ve also shown that it can be used to exonerate the innocent,” said Richard M. Aborn, the president of the Citizens Crime Commission.

Mr. Cuomo has made expansion of the DNA database...