Is there any case law where police officers have been accused of making false promises about leniency to defendants?

On appeal, defendant first complains the officers suggested he would receive treatment, not punishment, if he confessed. (People v. Carrington (2009) 47 Cal.4th 145, 170 [" ' "police must avoid false promises of leniency" ' "].) They told him "a lot of people who do thing towards kids . . . [i]t's something that, maybe is wrong up here [indicating to head] . . . . [] There's help for that. [] [I]t's really not a criminal thing . . . it's an imbalance in their brain." One officer later said, "[n]obody's saying you're a criminal . . . [i]n fact we know you're not one," noting his lack of a prior criminal record.