Tennessee (WVLT) -- Our hot, dry days have been devastating for crops, and that may be changing the war on drugs.

All spring and summer, the governor's task force sends up helicopters and airplanes to spot marijuana plants among the states trees, brush, and legitimate crops.

But so far, a sweep of the top four counties, for growing marijuana- has turned up nothing.

Last year, drug agents seized and either harvested or destroyed more than half a million marijuana plants.

But this season's drought has dried up the streams and made it tougher to irrigate.

"You know, marijuana's not the most robust plant," said T.J. Jordan of the Tennessee Bureau of Investigation. "It takes some tending and some cultivation, and when it doesn't have mother nature cooperating, it's definitely going to have an impact."

Of course, criminals and entrepreneurs are nothing, if not creative.

Police expect many will move their operations indoors, using chemicals and grow lights.

The crops will be smaller but they'll be tougher to find, too.