Oklahoma Bureau of Narcotics and Dangerous Drugs agents showed off tactics and techniques they use to eradicate marijuana crops in the state to media and legislators on Wednesday.

The bureau has been working out of Norman all week, flying as far north as Guthrie, south to Pauls Valley, east to Shawnee and west to El Reno, spokesman Mark Woodward said.

Agents start searching for the crops in June and continue sweeps until the first freeze, he said.

“It's something we've done in the late summer since the late '80s,” Woodward said.