The letter said this is known as "Greyhound therapy," and suggested that placing patients on buses could be a form of kidnapping. It also suggested that busing mental patients out of state could violate a federal law that requires mental patients to be stabilized before release.

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"We respectfully request that the Department of Justice and the Department of Health and Human Services investigate to see if any federal laws have been violated by the State of Nevada," the members wrote to Attorney General Eric HolderEric H. HolderFBI director defends agency after Trump attacks: It's an 'honor to represent you' FBI agents fire back at Trump: Saying we're not dedicated is 'simply false' Holder hits back at Trump: The FBI’s reputation is not in 'tatters' MORE and HHS Secretary Kathleen SebeliusKathleen SebeliusObama cabinet official: Clinton White House doubled down on 'abusive behavior' John Roberts has tough job of keeping faith in Supreme Court Price was a disaster for HHS — Time for an administrator, not an ideologue MORE.

The letter also asked for an investigation into whether the two clinics reportedly engaging in "Greyhound therapy" have broken any laws. They are Southern Nevada Adult Mental Health Services and Rawson-Neal Psychiatric Hospital.

"Additionally, we request that you examine if the practice of 'Greyhound Therapy' is occurring in any other states," the letter adds. "Federal investigation is warranted here, particularly in light of admissions from Nevada officials that their own investigation found 'no pattern of misconduct.' "

The letter asked that Holder and Sebelius report back to them after 30 days on the status of the investigation.