outdoors, there is no need for sophisticated 'heat-seeking' technology, etc ... simple infra-red camera film (available at any good camera shop) will make marijuana plants stand out as 'white, or light-colored foliage' - so, when the chopper flies over, it can take a simple photograph, develop it, and 'see' all our 'white plants' - fortunately, they don't like paying cops to hike all over the countryside thru poison oak, lions, tigers, and bears, etc, to scavenge a few scattered plants, they're looking for the BIG crops - worth the effort and expense, and producing great big busts for newspaper headlines (it justifies their budgets) - no biggie, not that complicated :jointsmile: