By Kristen Johanson

PHILADELPHIA (CBS) — Philadelphia’s District Attorney has announced a new policy which directs prosecutors to ask for lighter sentences, and to add up how much that time behind bars will cost taxpayers.

When city prosecutors recommend sentencing guidelines to a judge, they now must explain their reasoning and note the price tag of imprisonment, according to the new policy under DA Larry Krasner.

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“The District Attorney’s Office, along with the judiciary committee, are stewards of public resources that should carefully be directed towards trying to build a just society and make people safe,” said Krasner.

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City records show it costs at least $42,000 (between $42,000 to $60,000) to incarcerate one person for one year.

The objective, he says, is to end mass incarceration – which “tears the fabric” of defendants’ families and work relationships that Krasner says “tend to rehabilitate them.”

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“I am not going to tell judges what they should or should not do in making their own independent considerations,” Krasner said.