A fourth officer charged in the case isn't a registered medical marijuana patient, but his wife is.
Records also show a Belmont couple accused of supplying the four officers with marijuana butter are registered medical marijuana caregivers.
Police said the drugs were shared by those involved and not always provided directly from caregiver to patient.
The butter is made by heating ground marijuana buds and butter, straining the plant material, and using the butter in cooking or as a spread.
The corrections officers are on unpaid leave. They each have worked at least 20 years for the Sheriff's Department.