(CNN) In Wednesday night's Democratic presidential debate in Detroit, Tulsi Gabbard decided to drop her opposition research book right on Kamala Harris.

Amid a broader conversation about criminal justice reform between the California senator and former Vice President Joe Biden, the moderators turned to the Hawaii congresswoman. And she unloaded:

"Senator Harris says she's proud of her record as a prosecutor and that she'll be a prosecutor president.

"But I'm deeply concerned about this record. There are too many examples to cite but she put over 1,500 people in jail for marijuana violations and then laughed about it when she was asked if she ever smoked marijuana.

"She blocked evidence -- she blocked evidence that would have freed an innocent man from death row until the courts forced her to do so. She kept people in prison beyond their sentences to use them as cheap labor for the state of California."

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