A former chairman of the Devon National Farmers Union has admitted allowing his land on Dartmoor to be used to grow cannabis.
John Shears has denied a second charge of producing the drug at his farm and now faces a trial at Exeter Crown Court next year.
Police seized 189 plants at the farm in May - capable of producing drugs worth thousands of pounds.
A member of the Dartmoor Park Authority has been arrested and bailed by police following the discovery of 189 cannabis plants at a farm in Devon.
69 year old John Shears, from Chagford near Newton Abbot, is a former branch chairman of the National Farmers Union.
Devon and Cornwall Police also arrested three other men on suspicion of production of Class B drugs.
All four men were questioned at Launceston Police Station in Cornwall and are due to answer bail on August 7.
Jackie Bird reports as a Plymouth professor reveals the results of an eight year national study into Multiple Sclerosis at a national conference today. The project found that cannabis use, shown to ease the symptoms of MS, didn't actually slow the progress of the disease down.
Scientists at Plymouth University say cannabis has no effect in halting progressive multiple sclerosis. But they say it may have some benefit for people with less serious MS.
Experts studied 500 people with MS over an eight-year period. Some were given capsules containing the active ingredient in cannabis, while others were given placebos.