(Tulsa, Ok)--It used to be a common event for Oklahoma law officers. They were often finding fields of marijuana plants, sweeping in and destroying them. Intense marijuana eradication efforts in past years make such fields like the one discovered this week near Mannford in Creek County a rare find. Sheriff's Captain Mike O'Keefe says this one was well cared for and the mature plants were ready for harvest. The estimated value of the crop is over $100,000.