The state is investigating the circumstances surrounding three recent deaths at the hospital.
At least seven states are now investigating the company, including Ohio.
At least five other states are investigating complaints about sales tactics.
Other state and county officials are still investigating the death.
The state is investigating whether the landfill contains toxic materials.
Ms. Clinton's death was one of the few the state has investigated at adult homes.
Officials said that four states were investigating the sales.
One state, Kansas, is investigating nearly 100 consumer complaints against the company.
The state is investigating whether chemicals in drinking water may be involved.
The state investigated the charges but found no evidence of wrongdoing.