In the 1939 case Minnesota ex rel. Pearson v. Probate Court of Ramsey County, the U.S Supreme Court dealt with issues related to mental health and civil commitment procedures. The appellant, Mrs. Ada E.Pearson was committed involuntarily to a state hospital for psychiatric treatment by her husband without being given an opportunity for a court hearing or legal representation before confinement - which she argued violated her Fourteenth Amendment rights to due process and equal protection under law. The Supreme Court ruled in favor of Mrs.Pearson, stating that while states have broad power in dealing with mentally ill individuals' care and safety, they must also respect their constitutional rights including fair procedure before involuntary commitment can occur. This landmark decision significantly impacted future mental health laws across America by establishing important procedural protections for those facing involuntary commitment.

In the dissenting opinion for Minnesota ex rel. Pearson v. Probate Court of Ramsey County et al., Justice McReynolds disagreed with the majority's decision to uphold a state law that allowed for compulsory sterilization of "habitual sexual offenders." He argued that such legislation was unconstitutional as it violated an individual's right to due process and equal protection under the Fourteenth Amendment. Furthermore, he contended that this ruling would set a dangerous precedent by allowing states to enact laws infringing upon personal liberties based on subjective determinations of what constitutes social harm or public good. In his view, permitting involuntary sterilization in response to criminal behavior could potentially lead down a slippery slope towards other forms of state-sanctioned bodily mutilation or punishment without proper judicial oversight or safeguards against abuse.