An attorney representing three of the seven people who were poisoned at a Japanese steak house in Pace, Fla., last Friday said two of them tested positive for methamphetamine, he told Pensacola’s WEAR.

Attorney Aaron Watson obtained medical records for clients Mathew Gilley and Jordon Gray, both of whom tested positive for meth after blood and urine tests. Both men ate at Nikko Japanese Steak House Friday night, the attorney told the TV station.

The Santa Rosa Sheriff’s Office began investigating last Friday’s incident after at least seven people reported to local hospitals seeking treatment.

On Monday, the sheriff’s office confirmed to AL.com the seven people tested positive for a narcotic, but declined to release information on the specific narcotic.

The sheriff’s office interviewed one individual in connection with the case, but that person was excluded as a suspect. Additional interviews have and continue to be conducted.

According to the report, investigators say the restaurant owners have been cooperating in the investigation. The restaurant reopened Tuesday.

Investigators have yet to determine how the drug got into the food. In addition to the Santa Rosa Sheriff’s Office, the Florida Department of Business and Professional Regulations and Division of Alcoholic Beverages and Tobacco are investigating the incident.