Arizona Attorney General Mark Brnovich is looking into the marketing practices of a company that manufactures opioids.

Documents filed by Chandler-based INSYS Therapeutics with the Securities and Exchange Commission shows the company has received a civil investigative demand from officials here and in other states. The filing also says the company understands that numerous physicians have been served with subpoenas about their interactions with Insys.

The demands focus on a product called Subsys, a form of the opiate fentanyl, which is applied by spraying it under the tongue. It’s currently the company's only approved product. A spokesperson for the attorney general would not comment on a potential investigation.