https://econofact.org/the-effects-of-ban-the-box-on-the-employment-of-black-men
The researchers sent job applications on behalf of fictitious applicants that varied their perceived race and felony record status both before and after BTB laws went into effect. They found that when employers were allowed to ask about criminal histories, white applicants had only a slight advantage over similar black applicants who had the same criminal record status. After Ban the Box policies were implemented this gap widened dramatically: White applicants were 43 percent more likely to get a callback than similar black applicants (see chart). While black men with records saw small gains in callbacks after BTB, this was offset by even larger decreases in callbacks to black men without felony convictions.