COMPAS is a recidivism risk assessment system produced by Equivant. The exact algorithm is secret, but it has been empirically shown to be biased against Black people1 and young people.
Julia Angwin et al., “Machine Bias” (ProPublica, May 23, 2016), https://www.propublica.org/article/machine-bias-risk-assessments-in-criminal-sentencing.