Oregon regulators said they are investigating two retailers that account for more than 33% of all individual sales totaling 8 ounces or more of medical cannabis.
They are located in Multnomah County, which includes Portland.
The disclosure comes days after the OLCC slashed the daily cap on patient purchases of medical marijuana from 24 ounces to an ounce.
According to Willamette Week, the OLCC provided a spreadsheet noting that 98% of MMJ purchases were already less than the new limit.
This flurry of OLCC activity reflects what regulators see as an oversupply problem in the state. They say too much cannabis is leading to the diversion of MJ to both the in-state black market as well as outside Oregon.