Several federal agencies are investigating whether the large chain of psychiatric hospitals held patients without medical justification.

Shares of the company, one of the largest chains of for-profit psychiatric hospitals, were down 25 percent at one point.

Acadia Healthcare is holding people against their will to maximize insurance payouts, a Times investigation found.

The clinics’ owner, Dr. Jihad Mustapha, who called himself the “leg saver” but whose procedures sometimes preceded amputations, was a focus of a Times investigation...

Mothers have complained that Melanie Henstrom, a lactation consultant in Boise, Idaho, pressured them to get their babies’ tongues lasered by a dentist.