Regression therapy, for example, which is based on largely discredited psychoanalytic theories about the operations of the unconscious mind, is therapeutic, and ought to be subject to Federal prohibition (there still being a role for government involvement with medicene under any legitimate system of government). The same goes with "sexual orientation therapy" quackery.
And well so, at least in the case of hypnotists. Consider the existence of false memory syndrome, which lead to the convictions of dozens of innocents in the late 1980s and early 1990s as Satanic pedophilic racists. These notions were implanted in their minds by hypnotists.